Hey buddy!
I am struggling with General maths as maths is my weakest subjects.. Plus i got my Trial on this coming monday .. Can u please Assist me of how to get it done and stuff
Thank you
Regards
Hammad Ahmed
Hi! I have one weakness in general exams in that I tend not to read the question correctly and then make silly mistakes!Two simple suggestions:
Do you have any exam strategies or tips that will maximise marks in the test?
Thanks so much :)
Hi! I have one weakness in general exams in that I tend not to read the question correctly and then make silly mistakes!
Do you have any exam strategies or tips that will maximise marks in the test?
Thanks so much :)
Thanks so much everyone! Really great info especially coming up to trials :)
What have you found is the most effective way to use a maths textbook? Should i be doing all the questions in order, or a few randomly?
What have you found is the most effective way to use a maths textbook? Should i be doing all the questions in order, or a few randomly?
Definitely agree with Rui's comments. I think going through questions in your textbook is super important, and definitely necessary at some point in the year. I wouldn't be going back and doing them multiple times though (unless you're super keen); I would be doing past papers over and over again until you're so bored that the exam will feel like just another study session. Still, textbooks are great revision of content if you've forgotten how to do a specific topic (then again, I guess that's what we're here for as well!).
Jake
??? Hey I need help with this question I really can't figure it out:
"Tabitha received a 17.5% holiday loading on four weeks normal wages. She normally works a 32 hr week. Her 4wks holiday pay and loading is $2 587.90.
a) Find her normal weekly pay
b) Find her normal hourly pay rate
Thankyou!
Hi first post here.Thanks heaps for your awesome work Gregs. Great to have you on the forums, and so important/valuable to have valuable contributors such as yourself as part of the community. Tonight's been the busiest day in the NSW forum's history, so I can only assume we're going to need people dishing out great answers where they can like Gregs has done today!
In regards to your question Gabisperring
"Tabitha received a 17.5% holiday loading on four weeks normal wages. She normally works a 32 hr week. Her 4wks holiday pay and loading is $2 587.90.
a) Find her normal weekly pay
b) Find her normal hourly pay rate"
Firstly we need to work out how much money Tabitha would've earned without the 17.5% loading. To do this divide $2587.90 by 117.5% -- Because 100% is her normal wage and 17.5% is her loading so 117.5% are these two amounts combined -- This gives an answer of $2202.47
Divide $2202.47 by the 4 weeks that she worked. This works out her normal weekly pay which answers part a) ($550.62).
To "find her normal hourly pay rate" divide the amount she gets per week ($550.62) by the number of hours she works per week (32)
This should give you and answer of $17.21 -- this is the answer to b)
Heyyyy can someone please help me out with categorical and quantitative data... I always mix them upIf my memory serves me right this is just distinguishing between data that just associates an event with a subset or a category, contrasted to where an actual number gets associated.
Thanks heaps for your awesome work Gregs. Great to have you on the forums, and so important/valuable to have valuable contributors such as yourself as part of the community. Tonight's been the busiest day in the NSW forum's history, so I can only assume we're going to need people dishing out great answers where they can like Gregs has done today!
Really, wow, that must be hard for you all :'(No, this is like the most exciting day of my bloody life.
No, this is like the most exciting day of my bloody life.
Heyyyy can someone please help me out with categorical and quantitative data... I always mix them up
Quantitative - where a number gets assigned either:<3
Discrete: eg. 0, 1, 2.. out of 10
continuous: heights of a group of people which can continuously go up and up etc
Categorical - putting something in a specific category
Nominal - does not have order e.g Male or Female
Ordinal - has value/order e.g A B C D E grade system
;D ;D
Quantitative - where a number gets assigned either:Too bad I can't describe discrete and continuous in more mathematical terminology in this thread
Discrete: eg. 0, 1, 2.. out of 10
continuous: heights of a group of people which can continuously go up and up etc
Categorical - putting something in a specific category
Nominal - does not have order e.g Male or Female
Ordinal - has value/order e.g A B C D E grade system
;D ;D
Too bad I can't describe discrete and continuous in more mathematical terminology in this thread
Why not??True. Just didn't want the general guys to jump :P so I'll put in some informality.
True. Just didn't want the general guys to jump :P so I'll put in some informality.
You could say discrete data is formed out of the integers, or some finite set (because they can be corresponded to the integers or any counting numbers really). Discrete can be used to say how there's gaps, and the distinction between two consecutive (discrete) elements are quite obvious. Like you obviously skip over a load of rational numbers to get from one integer to the other.
You could say same goes for rational numbers as well, because you don't know where the next irrational number is but you know that one is obviously there.
Something continuous would be like all reals. An entire field of elements, one after the other and you really can't tell one apart. If you're on a continuous interval, you're basically mapping all the real numbers or just some closed/open interval that's a subset of R.
This is why height can be seen as continuous. You can say that you're 172cm tall but what if you're 172.9141244255231014597...cm tall
HaiWith general maths, it will be much harder to find past trial papers. If you do get your hands on them however? Great.
its my first time here and so far, i'm loving the resources and support offered on this site.
concerning general maths, i have a huge problem with sitting tests~ my mind goes blank and nothing makes sense.
plus i also find the finance topic hard to understand, what type of practice should i do to make sure i don't blank out?
~ this has happened on multiple tests now and i really don't want it to happen on my trials!
I meant like how you guys have to organise lectures and such but at the same tine there are people here on the forums who need help and if you have to help out and prepare for lectures then that's going to be too much work for you all. You get what I mean?
Quantitative - where a number gets assigned either:
Discrete: eg. 0, 1, 2.. out of 10
continuous: heights of a group of people which can continuously go up and up etc
Categorical - putting something in a specific category
Nominal - does not have order e.g Male or Female
Ordinal - has value/order e.g A B C D E grade system
;D ;D
Please know you need to be a tutor when you finish the HSC with how well you have been explaining things and answering questions lately, just saying ;D
Quantitative - where a number gets assigned either:
Discrete: eg. 0, 1, 2.. out of 10
continuous: heights of a group of people which can continuously go up and up etc
Categorical - putting something in a specific category
Nominal - does not have order e.g Male or Female
Ordinal - has value/order e.g A B C D E grade system
;D ;D
With general maths, it will be much harder to find past trial papers. If you do get your hands on them however? Great.
PastHSC has a list of the questions arranged with respect to the syllabus updated 2014. My advice is to do the past papers from the older years (keeping the recent ones for your final HSC exam), and maybe one (or two) papers under exam conditions. Figure out why your mind goes blank in tests.
(If you rely on the textbook too much, there is your answer. Textbooks, whilst not being ridiculously off, will never reflect the scope of an exam.)
Ask your school for any past papers that they might have and do them. Also redo your past exams figuring out where you went wrong and what the right frame of mind is.
Regarding the finance topic, for actual questions you may struggle on just post them on here and we'll guide you through a thought process.
I was wondering, from the work we did in preliminary, what is assessable in HSC? The teacher said all of it, in theory - is that right?Yes. Keep in mind that maths is different to every other subject in that the preliminary course is EXAMINABLE. Up to 20% of the final exams are allowed to include content taught in the preliminary course.
I was wondering, from the work we did in preliminary, what is assessable in HSC? The teacher said all of it, in theory - is that right?
Now that the website is back online
I knew about some of the ones where things were continued or skills and techniques were carried on, but I didn't know that everything could be tested. I had noticed some things had been in past papers, like mobile costs, so I have revised it briefly, but yeah, I didn't know about the 20%.Our General Maths lecturer has published an incredible set of notes that covers all of the Prelim content pretty briefly which is perfect for revision. We sell them on the shop here.
Thank you for the help - have you got any advice on how best to study for general? Just revise all of it?
I knew about some of the ones where things were continued or skills and techniques were carried on, but I didn't know that everything could be tested. I had noticed some things had been in past papers, like mobile costs, so I have revised it briefly, but yeah, I didn't know about the 20%.Even in general, you need to keep doing past papers as brenden said. It just so happens that this is especially true for maths since maths is all about applying what you know, not going off memory.
Thank you for the help - have you got any advice on how best to study for general? Just revise all of it?
Hi!
I was just wondering if anybody could let me know if in a General Mathematics HSC exam, they could ask us to draw a radar chart and fill in the information given for it?
I have just done a practice question from an Excel book, and they asked me to draw a radar chart, but I have never seen this in a past HSC paper before??
Thankyou!
Hi!
I was just wondering if anybody could let me know if in a General Mathematics HSC exam, they could ask us to draw a radar chart and fill in the information given for it?
I have just done a practice question from an Excel book, and they asked me to draw a radar chart, but I have never seen this in a past HSC paper before??
Thankyou!
Hey Jamon, so I really struggle in Math with conversions, like converting 1mm into 1km, or mm into L, and it really stuffs me up when I get a question where I have to do a large conversion because I just get so jumbled up! Do you know any good techniques/ways with conversions? thanks :)
Hey Jamon, so I really struggle in Math with conversions, like converting 1mm into 1km, or mm into L, and it really stuffs me up when I get a question where I have to do a large conversion because I just get so jumbled up! Do you know any good techniques/ways with conversions? thanks :)
Two simple suggestions:
Use a highlighter.
Copy out valuable pieces of information CLEARLY stating what it is on the SIDE.
Hi,
I was just wondering how you answer this question,
Milla enters $58 a month into a superannuation fund. It is expected that the fund averages 12%p.a compounded monthly. Find the expected value of the fund after 25 years
I get all the divide 12% by 12 to get the rate of the monthly compound and multiplying 25 by 12 but what equation do you use to add the $58 each month into the end result.
Cheers, Gregs :-\
Thanks Jamon, I can't remember seeing it in class but I'll try and remember it for the exam tomorrow ahah I was thinking it could've been one of those questions not in the syllabus any more.It probably is. I found it on the outdated formula sheet but not the current one.
It probably is. I found it on the outdated formula sheet but not the current one.
As in it's probably one of those not in the new syllabus
Thanks Jamon, I can't remember seeing it in class but I'll try and remember it for the exam tomorrow ahah I was thinking it could've been one of those questions not in the syllabus any more.
Hi,
I was just wondering how you answer this question,
Milla enters $58 a month into a superannuation fund. It is expected that the fund averages 12%p.a compounded monthly. Find the expected value of the fund after 25 years
I get all the divide 12% by 12 to get the rate of the monthly compound and multiplying 25 by 12 but what equation do you use to add the $58 each month into the end result.
Cheers, Gregs :-\
Hey Gregs! Okay so in the exam you may get a question like this, but you will be provided with the contribution/annuity table! So all you need to do is line up the rate with the number of periods from the table according to the question, and times that compounding factor from the table by 58. As long as everything is in months you should get the answer!! Please note: You will always be provided with a table and WILL NOT need the annuity formula as mentioned by Jamon (bloody Extension kids trying to do General ;) ) Good luck!! Please ask more questions if need be!
Thanks for the help guys!
I believe the answer is 330 but the marking guide says its CDraw a compass (North-South-East-West) from B.
can someone explain why please?
I believe the answer is 330 but the marking guide says its CHey!
can someone explain why please?
Hey,
I've been struggling with this one question for Spherical Geometry.
I was wondering if I could get some help with it? The answer is meant to be 10 500km.
Thanks,
Katie
Q.
It is possible to fly from Perth (32oS, 115oE) to Tierra del Fuego (54oS, 65oW) on the southern tip of South America by doing directly over the South Pole along a line of longitude. Calculate the great circle distance between Perth and Tierra del Fuego (nearest km)
Hey Katie! So the formula you need is:
So in this case r is taken as 6400km, from you reference sheet, just the radius of the earth. The hard bit is the angle. Let's consider what is happening here.
The plane (or equivalent airborne vehicle thing) needs to fly down through the south pole and then back up to Tierra Del Fuego. To get to the south pole, it flies from 32 degrees south, to the south pole, that's an angular distance of 90-32=58 degrees, because the south pole is 90 degrees. Then, it flies UP to Tierra Del Fuego, and this is a distance of 90-54=36 degrees.
Add these together to give an angle of 94 degrees, then solve!
I hope that helps ;D
In the Maths Lecture powerpoint from the Notes section is the answer to question 22 incorrect?
The answer is supposedly $1622 but shouldn't it be $1209.5?
Hi,
Could I please have some help with this question from spherical geometry.
Thank you :)
Sorry this is more of an administration question, but why doesnt any general maths questions come up on my unread topics board page thingy or sidebar?
Seeing as im a mod i want to try to contribute as much as possible!
It wouldn't appear in the sidebar because it isn't recent (well this one is now), but as for 'Unread Posts,' did this show up? ;DYes it showed up now thanks :)
For this question the possibilities are
3,3
5,1
5,1
4,2
4,2
3,3
so it would be 1/36 + 1/36 + 1/36 + 1/36 + 1/36 + 1/36 = 1/6
but the answer is 5/36 could anyone tell me what exactly i'm doing wrong?
question from 2013 hsc past paper
wooops what a silly mistake
thanks haha
For this question the possibilities areAs a tip, try to write out your numbers such that the ordering matters. That way, your first number corresponds to die 1, \your second to die 2, and you open up opportunity for comparison.
3,3
5,1
5,1
4,2
4,2
3,3
so it would be 1/36 + 1/36 + 1/36 + 1/36 + 1/36 + 1/36 = 1/6
but the answer is 5/36 could anyone tell me what exactly i'm doing wrong?
question from 2013 hsc past paper
Hi,
could I please have some help with chapter 10 Exercise 10.07 questions.
Thank you :)
Hi,
could I please have some help with chapter 10 Exercise 10.07 questions.
Thank you :)
Edit: Jake beat me but I'll post anyway because our answers end up different, mistake in finding your constant Jake? I'm doing mentally so not sure :P
Hi there! My working might differ slightly from the typical method you use in General Math, but it should be close! There is also an error in the wording of the question, it should read, of the cable is varied.
So, what we have here is a proportional relationship, because \(M\) grows in proportion to \(t^2\).
We can write this in two ways:
Here, \(k\) is our constant of proportionality. We can use either of these relationships to proceed (they are, in effect, the same thing) but I'll use the second one.
So we know that when \(t=1.2\), \(M=1440\). This lets us find \(k\):
What this proves is that the weight that the cable can carry is always one thousand times greater than the square of the thickness of the cable. We can use this to solve both our questions. For Question A, if we have a thickness of 0.7 centimetres:
Try your luck at Question B by substituting into the equation, the only difference being you'll have to rearrange, because you are looking for t!
You don't have to use the equation btw, you can just figure out the relationship between \(M\) and \(t^2\) and then apply it, but the equation formalises the matter ;D
Edit: Jake beat me but I'll post anyway because our answers end up different, mistake in finding your constant Jake? I'm doing mentally so not sure :P
Hi there! My working might differ slightly from the typical method you use in General Math, but it should be close! There is also an error in the wording of the question, it should read, of the cable is varied.
So, what we have here is a proportional relationship, because \(M\) grows in proportion to \(t^2\).
We can write this in two ways:
Here, \(k\) is our constant of proportionality. We can use either of these relationships to proceed (they are, in effect, the same thing) but I'll use the second one.
So we know that when \(t=1.2\), \(M=1440\). This lets us find \(k\):
What this proves is that the weight that the cable can carry is always one thousand times greater than the square of the thickness of the cable. We can use this to solve both our questions. For Question A, if we have a thickness of 0.7 centimetres:
Try your luck at Question B by substituting into the equation, the only difference being you'll have to rearrange, because you are looking for t!
You don't have to use the equation btw, you can just figure out the relationship between \(M\) and \(t^2\) and then apply it, but the equation formalises the matter ;D
Hi all!How they work is just a matter of words.
Is anyone able to explain how to work out simultaneous equations? Both the substitution and elimination method.
Thank you all :)
Hi all!
Is anyone able to explain how to work out simultaneous equations? Both the substitution and elimination method.
Thank you all :)
Hi all!
Is anyone able to explain how to work out simultaneous equations? Both the substitution and elimination method.
Thank you all :)
Hi I was just wondering if anyone could help me with the CSSA trial exam question 28b)
The following formula can be used to calculate the number of standard drinks in a container of alcoholic beverage:
N=VA/1.27
Where:
N= number if standard drinks
V= volume of container in litres
A= the percentage of alcohol in the drink (%alc/vol)
White wine has 11.5% alc/vol.
How many millilitres of white wine is equivalent to one standard drink? Answer to the nearest millilitre
Cheers, Gregs
Thanks for that, it helped a lotYeah I suspect that's going to be a common mistake. My advice is just to double check the units whenever they give you them. For that question the units actually included the percentage sign as is.
I was dividing it by 11.5% rather than just 11.5 so i was getting ~11 000ml
couldn't wrap my head around it
**This is my first post in this website so hopefully this is how you do it!! haha**
I really suck when it comes to conversions *such as MB to GB, cm^3 to L, Watts to Kilowatts* because I don't really know much from them as I only done General Math 2 in Year 12 and only know whats on the formula sheet haha
Is there a sheet or a summary of all the conversions that I need to know in terms of measurement?
-Nicole
**This is my first post in this website so hopefully this is how you do it!! haha**
I really suck when it comes to conversions *such as MB to GB, cm^3 to L, Watts to Kilowatts* because I don't really know much from them as I only done General Math 2 in Year 12 and only know whats on the formula sheet haha
Is there a sheet or a summary of all the conversions that I need to know in terms of measurement?
-Nicole
Hey so I was just wondering whats the best most effective way to study finance maths because no matter how hard I try and do multiple practice questions of all weighing (hard or easy) I never seem to understand it!! Please suggest some ideas thank you!! :)
Hi, Ive been struggling to understand how to find an obtuse angle for this question. As you can see i got the first two completely wrong.It's actually a bit hard to see the question; the diagram is a bit too small and thus the writing has gone tiny. So I can't exactly do the question.
Could you please help? Thanks :)
Hi, Ive been struggling to understand how to find an obtuse angle for this question. As you can see i got the first two completely wrong.
Could you please help? Thanks :)
Hey there!! So I'm going to confer with our General Lecturer on this, because I believe this is something that's a tad beyond the scope of the General course. It's in there, but right on the edge, because the syllabus asks you to:
- Establish the ratios for obtuse angles using a calculator
- Determine the sign of the ratios for obtuse angles
At no stage are you asked to specifically find obtuse angles, so this is borderline ;)
In any case, let me lend a hand with the first of those questions!
So we've got a negative angle here, uh oh! This doesn't make sense in this scenario, and as Rui correctly says, we fix this by adding 180 degrees to the angle. So:
You don't need to understand why it works, you just need to understand THAT it works (unless Steph comes along tomorrow and wrecks me for saying that) ;)
I'm not sure how much of this you need to know; because there is a whole set of rules in place to handle all sorts of different circumstances and finding obtuse angles. Note that for you, it will be far more common to be using the sine/cosine rules to find obtuse angles, not the trig ratios! I'll ask Steph to stop by tomorrow and perhaps shed some light on this for us ;D
Hi Daliaradosevic and Jamon,
Thank you so much this does help me work out the question. I know its not a big part of the syllabus and abit beyond general maths, thats why I was suprised I found a question on it.
Youre working out is very clear and easy to understand Jamon, thank you.
When I originally tried to do it I was confused as to why if im finding an obtuse angle, the number wasnt bigger than 180, but now i understand to add 180.
Thanks again :)
Hey Nicole! In addition to Jamon's post (which I thank him for), these are some capacity formulas worth knowing
Hope that all helps :)
hey op, i thought 1m^3 was 1000 liters, which in turn was 1 kilo liter
Yes sorry you're right!
Hi kmorritt, was going to post a 'General Math' friendly explanation, but it seems that you understand their explanations so I'm very glad :) Please keep asking questions if need be, and good luck!Hi stephanieazzopardi, thank you anyway. Yes will do :)
Hi General Mathematicians ::)Remember that all time zones are based off a thing called the "prime meridian" in Greenwich, England. That's the universal time centre - GMT +0
I have an issue... i love spherical geometry but... it always confusing me when we come to times zones whether I have to plus (+) or minus (-) the hours!!! >:( can someone please explain it in layman's terms.
Please and thank you!
Do we need to know that compound formula where you add period installments to it? Can't seem to find it in my textbook yet its relevant in the HSC past exams.Do you mean annuities? There's some information about it in page 76 of the syllabus, but I'm not entirely sure in how much depth you need to know it though.
nop, annuities are okay but its this formula or whatever it's calledThat's just the annuity formula in disguise. One of them is the FV whereas the other is the PV
nop, annuities are okay but its this formula or whatever it's called
Hi aimbotted! I can assure you that you will never be asked to use such formulas for annuities. You will always be given a table of annuities, you will never have to work out the annuity/contribution factor yourself!
Remember that all time zones are based off a thing called the "prime meridian" in Greenwich, England. That's the universal time centre - GMT +0Oh okay, yes yes. So it is sort of like which direction we are travelling from a place?
The more to the east we go, the more hours we add.
The more to the west we go, the more hours we minus.
So if we go 15o to the east of Greenwich, we add 1 hour on.
If we go 30o to the west of Greenwich, we subtract 2 hours off.
Same applies in Australia. Ignoring daylight savings time for this purpose, if we go from Sydney to Perth, which is 30o west, we subtract 2 hours off.
Also remember that in total, you only have 180o east or west at most
Oh okay, yes yes. So it is sort of like which direction we are travelling from a place?
Thank you so much!
Does anyone know where I can get more past papers for general maths?
I have done 2015, 2014, and 2013, and what questions are the same from 2012, but I am still a bit worried about Friday....
Are there any papers getting around that are like mock HSC that someone could direct me to please??
Even more trials could help..
Thanks heaps!
Does anyone know where I can get more past papers for general maths?
I have done 2015, 2014, and 2013, and what questions are the same from 2012, but I am still a bit worried about Friday....
Are there any papers getting around that are like mock HSC that someone could direct me to please??
Even more trials could help..
Thanks heaps!
So it shouldn't matter that the course has changed in some areas?
I just didnt know if the whole ourse was different, or just particular areas....I know financial mathematics is slightly different, but I have learnt how to use the formula...so thanks, will go back and do all teh years previous!!
Thanks for that!
This is a great place to find General Mathematics Trial Papers if that helps too! :)
is this the place where we can post particular questions we need help with?
Hi i'm having trouble with this inverse proportion question. Would someone be able to solve it please?
Hey! If we have something that's inversely proportional, we can say that
Where v is the velocity, w is the weight the lift is carrying, and k is some constant. This makes sense; as weight increases, velocity will decrease!
To answer questions like this, we need to solve for the constant first, and then sub in the value they're looking for.
The information we are given is that, at w=320kg, v=16km/h. Therefore
Great! So, our equation is going to look like
For w=250kg, we get the answer of
Thus, the answer is B
could i please have some help with this question?
i was going through the slide from the lectures and couldn't figure out how the answer was achieved. 0.30 x 700 = 2100, but i'm having a blank and don't know how to use the table? thanks!
Question 5: 2014 HSC Specimen Paper
The spreadsheet shows monthly home loan repayments with interest rate changes
from February to October 2012.
(i) Xiang’s bank approves loans for customers if their loan repayments are no more than 30% of their monthly gross salary. Xiang wanted to borrow money to buy a house. Her monthly gross salary was $7000. She applied for the loan in October 2012.
What was the maximum amount that her bank would approve for her to borrow? and the answer given is $324 420
(table is attached)
hey! i don't know how to do the fancy formatting everyone does but i do know how to answer your question
Hi, I'm having trouble figuring out this medication question. Can someone solve it please?
If we have 20 drops per milliliter, and there are 600 milliliters, then there will be 20*600=12,000 drops. 4 hours = 4*60 minutes = 240 minutes. Therefore, there are 12,000 drops in 240 minutes, which is 50 drops per minute! So, the answer is C :)
hey! i don't know how to do the fancy formatting everyone does but i do know how to answer your question
30% of $7000 = $2100
in october, she has $2100 for loans and the highest she can go is on $1942
this $1942 gives her a loan of $300000
however she had 2100, so 2100-1942 = $158 left
therefor, the only loans she can get are $6.47 loans
so 158/6.47 = 24.42040185
24.42040185 x 1000 = 24420 in loans
24420 + 300000 = 324420, the maximum amount she can get
My internal mark is in the 70's, and my rank is 16th out of 70. Is it still possible for me to get a band 6 in general?
If so, what mark should I be aiming for?
You absolutely can still get a band 6 in general maths. I can't tell you what mark you need to aim for, except to say that it's completely possible, and likely if you put the work in. Your rank is good, your marks are good, and if you smash the HSC a band 6 is definitely within your grasp! If you have any questions, or anything we can help you out with, please post here :)
Hi there,The entire structure of the mathematics general course was revised in 2014.
I was was just wondering what I should expect the layout/structure of the paper to be. Will there be the questions (in section 2) and then dotted lines to fill in the working or will we be given a writing booklet? It's just that in going through past papers and they are all different.
Cheers!
Hi General Mathematicians ::)
I have an issue... i love spherical geometry but... it always confusing me when we come to times zones whether I have to plus (+) or minus (-) the hours!!! >:( can someone please explain it in layman's terms.
Please and thank you!
Im not sure if i pressed the correct button to reply...
You did Chris, thanks for your contribution ;D
Hi General Mathematicians ::)
I have an issue... i love spherical geometry but... it always confusing me when we come to times zones whether I have to plus (+) or minus (-) the hours!!! >:( can someone please explain it in layman's terms.
Please and thank you!
Hey Sarah!
My maths teacher has a little saying for this...the DAD rule. That basically stands for Different, ADd!
E.g. If you have 24* east and 48* west, as these two numbers are on different sides i.e. east and west, then add them.
However, if its 24 east and 48 east, then subtract 24 from 48. I suppose u could call this the SSUB rule (Same SUBtract :D)
I don't know if that helps, but I always remember it that way!! DAD rule!!
Hi, I have two questions.
1. How many kilobytes are there in 2 gigabytes? I'm having trouble solving this one!
2. (a) Alex is buying a used car which has a sale price of $13 380. In addition to the
sale price there are the following costs:
Transfer of registration $30
Stamp Duty .......
(i) Stamp Duty for this car is calculated at $3 for every $100, or part thereof,
of the sale price.
What does "part thereof" mean in this question? First time I've ever seen those words.
Any help is appreciated ;D
Hey! I think thats for calculating the longitudinal difference, not for when to add the hours!
What i do it use a line to indicate whether to add the hours like this:
i hope this is what you were looking for, and not the meridian and gmt stuff
Hi, I have two questions.
1. How many kilobytes are there in 2 gigabytes? I'm having trouble solving this one!
2. (a) Alex is buying a used car which has a sale price of $13 380. In addition to the
sale price there are the following costs:
Transfer of registration $30
Stamp Duty .......
(i) Stamp Duty for this car is calculated at $3 for every $100, or part thereof,
of the sale price.
What does "part thereof" mean in this question? First time I've ever seen those words.
Any help is appreciated ;D
Hey!!
Part thereof just means a part of 100 dollars.
I just did that q!
This means that you need to round 13380 up to 13400 so you have the parts of 100, as 80 is included as a part (80 is a part thereof of 100 if you know what I mean)
This means he will pay 134 * $3
Hope you get the part thereof bit!! Sorry, didn't explain it very well!
Gb to kb etc conversion is x2^10 - you need to do it twice so it's x2^20
You also have to include the 2 (amount of GB) so:
2gb = 2^1 x 2^10 x 2^10
=2^21
=2097152gb :)
Ohhh okay. Why did you put 2^1 in the conversion? Sorry, I'm really bad with file size!Because there's two gigabytes. Not one gigabyte.
Ohhh okay. Why did you put 2^1 in the conversion? Sorry, I'm really bad with file size!
Ahh ok. What if, for example, the sale price was $13,320, you would round it down to $13,300 right? Or would you round it up to 133,400?
Because there's two gigabytes. Not one gigabyte.
2 Gb = 2 x 2^10 x 10^10
Technically the ^1 was not necessary.
True, unless the question is like this multiple choice (unless it's just me who got caught up ha)The ^1 just makes it clearer. Still not necessary though :P
True, unless the question is like this multiple choice (unless it's just me who got caught up ha)
Because there's two gigabytes. Not one gigabyte.
2 Gb = 2 x 2^10 x 10^10
Technically the ^1 was not necessary.
2^1 is just the same as writing 2 (representing 2 GB) :)
Round it up to 13,400. Every unit over 100 is included as a part of the next 100 if you get what i mean
Yeah I get it now, thanks! :)
Just wondering If anyone can help me solve this multiple choice question ? thank you :)
21 Which equation correctly shows r as the subject of S = 800(1 – r)?
(A) r = 800 – S
800
(B) r = S – 800
800
(C) r = 800 – S
(D) r = S – 800
how's everyone feeling for tommorow?
Hi Rui for this question if it wasn't a multiple choice question I'd probably do
Hi Rui for this question if it wasn't a multiple choice question I'd probably do
S= 800-800r
S-800 = -800r
(S-800)/-800 = r
Why wouldn't that be right?
how's everyone feeling for tommorow?I don't know why, but I'm not feeling very stressed, usually I would be, but for this exam I feel properly prepared for once!
scared.
Can I have some help in this question please?
Ali's class sits 2 geography tests. The results of her class on the first test are:
58, 74, 65, 66, 73, 71, 72, 74, 62, 70
The mean was 68.5 for the first test, and calculated Standard deviation was 5.2
For the second test, the mean was 74.4 and the standard deviation was 12.4
Ali scored 62 on the first test. Calculate the mark that she needed to obtain in the second test to ensure that her performance relative to the class was maintained.
But whether or not you'd be marked wrong is not something for me to comment on.
I don't know why, but I'm not feeling very stressed, usually I would be, but for this exam I feel properly prepared for once!Good on you. It means you'll kill it tomorrow
So for this it's pretty much asking how far away from the mean she is in regards to the z-scores
-1 z-score = 63.3
-2 z-scores = 58.1
so Ali is somewhere in-between these two scores to work how far off of a z-score she is minus the 63.3 by her score
= 1.3 marks
1.3 marks is 1 quarter of a standard deviation ( 1.3/5.2 = 0.25)
so that means her mark is 1.25 standard deviations away from the mean
This means to stay relative to her class Ali needs to score a mark that is -1.25 standard deviations of the mean of the second test
1.25 x 12.4 =15.5
74.4-15.5 = 58.9
Ali needs to score a mark of 58.9 for her performance to stay relative to the class
Good on you. It means you'll kill it tomorrow
hahah thats how i always feel before every test, until i actually get in the room and realize how fucked i really amOh nah that was me last year. And then I got high marks anyway.
Could someone please help me with this question?
I can never get how to read these tables, or what they actually mean.
Could someone please help me with this question?
I can never get how to read these tables, or what they actually mean.
yasssss i canThankyou aimbotted!! ;D
1880 x 12 x 30 = 676800
however when he pays 80000 the graph decreases by 8 years
therefor 1880 x 12 x 22 = 496320
676800-496320 = 180480 in savings
however he paid a lump sum of 80000 so 180480-80000 = 100480
The drop in the graph is when he paid the lump sum, and we can see that he finishes paying the loan at 22 years when he pays the lump sum.
He paid the loan 8 years earlier. So we need to figure out how much he would have paid if he didn't pay the lump sum 8 years earlier:
8 x 12 x 1880 = 180,480
Now we minus the lump sum from $180,840 to see how much he saved:
180,480 - 80,000 = $100,480
So he saved $100,480
That exam was fucking disgusting TBH.We will open an exam discussion thread later. You can rant there
fucked me over so hard, this dumb cunt doesnt know how to do the 1st multiple choice question
We will open an exam discussion thread later. You can rant there
DID ANYONE GET THE LAST QUESTION???
Excuse capitals, but I spent probably about half an hour on it...my feeble brain just couldn't get it.....
Anyone have the same problem??
I didn't mind the rest of t...but still...
yep mean was 64 and sd was 10
(i) mean = 88 - (s x 2.4)
mean = 88 - 2.4s
(ii) mean = 52 - (s x -1.2)
mean = 52 + 1.2s
mean = 88 - 2.4s
mean = 52 + 1.2s
88 - 2.4s = 52 + 1.2s
-2.4s - 1.2s = -3.6s
52-88 = -36
-3.6 s = -36
s = 10
thus standard deviation is 10
88 - (10x2.4)
= 64
52 - (10 x -1.2)
= 64
thus mean is 64
Thanks!! U made it look so simple....and I just realised how to do it...I HATE exam nerves!!! :'(
Thanks again! :D
hi, i need some help for this question (it is year 11 General math btw)
Hi there
We just got results back from our first HSC task and everyone was pretty confused with this one question.
B) A kebab shop offers six different fillings for their kebabs. If Jo chooses three fillings for a kebab how many different possible choices could he make?
Everyone assumed because it said different to use the
6x5x4
Can someone please explain why we were wrong?
Hey all! I've had a massive amount of people asking for somewhere to get some help with General Mathematics content. Now, I didn't do the course myself, but I've done a lot of it in my own studies, either at the HSC level or even at uni (yes, General Math students are better at statistics than MX2 students, I didn't learn stats until I got to university) ;D
So, here is a place to ask questions!! I'll do my best to answer what I can, or I'd love to see you guys helping each other out as well! You'll answer it better than I could, and plus, teaching others is the best way to learn content, so helping out a peer is a win-win situation ;D
I hope everyone is going well with their studies ;D
PS - Remember to check out our free HSC lectures this July, including General Math!
Hi there
We just got results back from our first HSC task and everyone was pretty confused with this one question.
B) A kebab shop offers six different fillings for their kebabs. If Jo chooses three fillings for a kebab how many different possible choices could he make?
Everyone assumed because it said different to use the
6x5x4
Can someone please explain why we were wrong?
Hey Kira! Interesting - I'd assume you are right! However, the question never specifies that out of the 6 different fillings, that the 3 choices need to be different. That is, they could choose the same filling three times! So, it becomes 6x6x6 :) the choices don't have to be different, that's the discrepancy! Although the 6 choices are all different the choices don't have to be :)I don't know enough about kebabs (shame), but just out of curiosity does the ordering of the fillings matter?
(but then why would you choose triple of the same filling lol)
Hey Kira! Interesting - I'd assume you are right! However, the question never specifies that out of the 6 different fillings, that the 3 choices need to be different. That is, they could choose the same filling three times! So, it becomes 6x6x6 :) the choices don't have to be different, that's the discrepancy! Although the 6 choices are all different the choices don't have to be :)
(but then why would you choose triple of the same filling lol)
Hey Jamon!!
My problem is usually with the practice exams! And I know, people have been telling me to do more practice papers to get better at those Band 6 Questions. But honestly, I think the real problem is with the "thinking process" that is involved.
For example, if we get a Band 6 Trig Question and it's very unfamiliar... What is the thinking process that you or anyone who is a Band 6 in Mathematics undergo?
i hope my question make sense hahah...
I don't know enough about kebabs (shame), but just out of curiosity does the ordering of the fillings matter?
If it targets band 6, you're not supposed to have seen it before.
Hey Jamon!!
My problem is usually with the practice exams! And I know, people have been telling me to do more practice papers to get better at those Band 6 Questions. But honestly, I think the real problem is with the "thinking process" that is involved.
For example, if we get a Band 6 Trig Question and it's very unfamiliar... What is the thinking process that you or anyone who is a Band 6 in Mathematics undergo?
i hope my question make sense hahah...
Well if this is a HSP then the order definitely matters. To the shops who put cheese on TOP of the meat, not within or below, then shame on you. Shame.Pfft I will never have an HSP, too oily.
But for a kebab the order definitely doesn't matter ;)
Well, if the order doesn't matter, don't you have to divide out by 3x2x1 (ignoring factorials at a general level because I dunno if they get taught it)
Hi there
We just got results back from our first HSC task and everyone was pretty confused with this one question.
B) A kebab shop offers six different fillings for their kebabs. If Jo chooses three fillings for a kebab how many different possible choices could he make?
Everyone assumed because it said different to use the
6x5x4
Can someone please explain why we were wrong?
Hello, I'm finding it difficult to understand the trigonometry topic and need some help solving this math's question.
I need to find the value of angle A in the triangle ABC. I am given the side length of AB which is 14cm and the side length of BC which is 9cm. I am then given angle C which is 48 degrees. I am meant to use the sin rule but I am unsure how to put this into a formula to solve it.
Thank you in advance :)
Hello, I'm finding it difficult to understand the trigonometry topic and really need some help solving this math's question.
Hello! I just had a question about financial maths - in a credit card question, if there is a 55 day interest period, for example, and the due date for payment is the 25th and the person pays after this date, will they be charged interest for each day of the 55 day interest free period, or will they begin charging each day after this date? Thanks for your time :D
Hey Snew! Welcome to the forums! ;D
The interest starts AFTER the 25th in your example - The interest free period is just that, interest free! You only pay interest for due amounts after this period :)
Hope this helps!! Sorry for the late reply, I wanted to check my answer before I gave it, I didn't do General so wanted to be sure 8)
Hey guys I have a few maths questions that I need some help with!! They're screenshots from an online test (HotMaths - not sure if you've heard of it). It has the answers just not the working so I'd love if someone could please explain how to get to the right answer!!
Aaaand another one....
And one more...
For this one, from the info given L (big one) = A(small one) + 500I'll probably format this one as well
2/3 A = 1/2 (A+500)
rearranging gives 1/6 A= 250
A= 1500
So L = 1500 + 500
= 2000
James has just turned 17 and plans on buying a car when he turns 20. He has a part time job and wants to deposit the same amount each quarter in an account earning 12% p.a. compounded quarterly. What amount:
Could be invested now to grow to $12000 in three years at 12% p.a compounded quarterly?
Cheers ;D
For this one you'd use the future value formula, which is FV = PV (1 + r)^n
...
Hope that helps!!!!
Hi thereUsually you get used to when to use what with practice. However, some people do prefer the guidelines as to when to use what rule:
So I understand this is probably a silly question but when do you use the sine rule and the cosine rule? I understand the maths of it just identifying the situation of which to use is what I'm struggling with. Any tips? :)
Hey!
I had a math test today, which i studied for, however there were so many questions which threw me off and since half yearlies are on its way, i was wondering if i could get any general tips and ways to study effectively for a maths exam, as i want to feel as confident as possible with the HY gen maths exam and not feel like crap after like today ahahah
Thanks :)
I'm not sure if I post questions on this thread or as a new topic thing like I did last time. I guess I'll just ask here and if I'm in the wrong spot let me know.
I'm having trouble with radical surveys. The worked example in my textbook only shows how to work it out if all the shapes are triangles. However the question I am doing at the moment (number 2a) looks like this (http://uploads.tapatalk-cdn.com/20170218/b0a431d7f39ba80573f87e29bbbe04fa.jpg)
Can someone please talk me through how to work it out
I'm not sure if I post questions on this thread or as a new topic thing like I did last time. I guess I'll just ask here and if I'm in the wrong spot let me know.
I'm having trouble with radical surveys. The worked example in my textbook only shows how to work it out if all the shapes are triangles. However the question I am doing at the moment (number 2a) looks like this (http://uploads.tapatalk-cdn.com/20170218/b0a431d7f39ba80573f87e29bbbe04fa.jpg)
Can someone please talk me through how to work it out
(http://uploads.tapatalk-cdn.com/20170303/37b7e6d1c5c95cd4f3f432498ef82647.jpg)
Hey all, can someone help with this question??
Thanks
Hey!
I had a math test today, which i studied for, however there were so many questions which threw me off and since half yearlies are on its way, i was wondering if i could get any general tips and ways to study effectively for a maths exam, as i want to feel as confident as possible with the HY gen maths exam and not feel like crap after like today ahahah
Thanks :)
Just struggling with this question any help would be appreciated
This definitely looks like a tough one! Let's take a look at the bottom triangle, and see if we can get anything out.
Firstly, let's label the height of each telegraph pole (since they're the same!) 'h'. Now, we know that
Rearranging,
Great! So, both telegraph poles are height 20m. Now, we can use the sin rule to find AD. We know that
Solving for AD gives us
Hi guys, I always seem to get probability questions wrong so would someone be able to give any tips on how to understand the wording of questions (like the one below), or if there's a cheat way to always get the right answer? haha thank you!!!
oh and also the second probability question is something i never learnt because I was away in year 10 when it was taught and didn't do prelim general, so if you could also explain how to do these questions that'd be much appreciated!! ;)
THANK YOU!!
Another question I got stuck with in my maths exam is this one below. Can anyone explain what the answer is and how to get it? (http://uploads.tapatalk-cdn.com/20170326/a873d144201188ec34867cb75e16d642.jpg) thanks!
What is the best way to manage time in exams?
Hi! Just wondering how to do question 5c and 6i in the attachment. Thanks!
Note: When I submitted the values into R (programming language) it told me that the lower quartile is actually 62.75. I'm not too sure why as I haven't had to do stem-and-leaf plots by hand in a while. It doesn't affect the final answer, but it could mess up working out.
I would have thought so too! But in actual fact (and I should have mentioned this before), the answer for question 5c is 30% for both data sets. Not sure how this answer was reached as the answers do not provide working out ...There's 16 numbers and 16 is divisible by 4 so I don't see how that works. Just in case I'm missing something in general maths I'll ask for some confirmation/correction
I would have thought so too! But in actual fact (and I should have mentioned this before), the answer for question 5c is 30% for both data sets. Not sure how this answer was reached as the answers do not provide working out ...
Hey! I'm with Rui, I don't get that answer of 30% - By definition each quartile represents 25% of your data, so the upper and lower quartiles should encompass 50% in both cases! :) it could be that the answer is incorrect? :)
I agree with both of you, I'm not sure how it works either but I think it means something different to how it sounds. The answer for question 6i is also different to what is expected (The answers say 56.25% for boys and 64% for girls)... I'll have to take it up with my maths teacher! Thanks anyway :)
Yeah I'm thinking we are misinterpreting the question somehow, let us know how you go!
hey guys!20% of the final exam is based off preliminary content. That should give you a rough indication on how to study for it.
This is more a general question but does anyone have any tips on how to revise for prelim and hsc content at the same time? Thanks in advance!
Hi guys,
Does anyone have any tips on how to approach studying for multipe choice questions for exams? It's something I struggle with, thankyou!
Moderator action: Posts merged. At times like this, please resort to editing your post instead of posting consecutively.
My maths teacher was also stumped! I guess we will just assume the answer given was a mistake...It has to be a mistake then for sure.
Hey guys,
Hope someone can help me, just doing a bit of maths homework and I'm struggling to figure out how to do this probability question.
'In Poker, a 'royal flush' is getting 10, J, Q, K and A of the same suit. Show that there is 1 chance in 649 740 of achieving this.'
please help!! ;D ;D ;D
{Jokers are conventionally excluded in Poker.}[/tex]Yep;
Ahh thankyou so much! So essentially its: 52 x 51 x 50 x 49 x 48 over 5 factorial? Then with the 4 favourable outcomes over 2 598 960, which simplifies to the answer, 1/649 740?
hi,
does anyone have any past papers on the focus study: health and mathematics?
much appreciated!
Hey! It might be worth having a bit of a look in this collection - There's heaps there, I'm not sure if any of it will be for this Focus Study but worth a shot! ;Dso many papers! thank you so much!!!
Hi all,Sometimes it can be inferred from the question whether you should treat it as ordered are unordered. The wording of the question may imply that common sense should be used.
This question is in regard to un ordered and ordered selections
When a question states how many possible selections are able to occur, is it unordered or order, I always thought that unordered in the question needed to state " How many diffrent possible selections" as that is what takes the double ups out
Hi guys! I have math question I'm stuck on, can someone please help me? Thank you.
It takes one man one day to dig a 4m x 4m x 4m hole. How long does it take 4 men working at the same rate to dig 16m x 16m x 16m hole?
Hi guys! I have math question I'm stuck on, can someone please help me? Thank you.
It takes one man one day to dig a 4m x 4m x 4m hole. How long does it take 4 men working at the same rate to dig 16m x 16m x 16m hole?
Hi sorry we have a maths exam coming up next week on only 4 specific topics and was wondering if anyone knew where to find papers or questions that are releated to specific topics.( As I have already done all the past HSC and textbook questions.) Thank youIt is honestly not a bad idea to pluck out only the relevant past papers out of trials and just do them
It is honestly not a bad idea to pluck out only the relevant past papers out of trials and just do themI know sometimes in the HSC and Trial questions there are like the questions that have hidden underlying topics like the capture recapture questions, how should we look at the question to see what topic its from? Thanks
The website may have some other useful things though.
hey! can someone please explain trig with obtuse angles? (i really don't get how it works)
Does anyone have any tips to ensure that silly mistake in exams are eradicated, normally I know how to do the question although i miss out a key part of the questionEradicating it is hard. People that eradicate silly mistakes are the ones that get state ranks.
Would anyone be able to break down the working out for 10 b and c for me please :)To ensure that we have exactly one ace, we put that in first. Note that there are 4 aces, so we have 4 possible outcomes.
Hi anyone/everyone!
I just got a sighted task back for General Maths and I failed. Like, really badly failed. I've had a 45-50% average for this subject this entire year, and I've been a little slack on homework because of competing priorities and math tends to get pushed to the side because of my 4u Major Work. I've always had a really negative mindset surrounding maths-- and I'm on 11 units so I can't drop, and half of it is going to count towards my ATAR whether I like it or not.
So is it possible that I can still pick up my marks for trials and HSC? I really don't want to end up with a Band 3. :-[ :-[
I've got my maths trial exam tomorrow and I'm doing last minute revision and review tests from my textbook. Can anyone help me with getting the answers for 14 and 15 cause nothing I seem to do matches up with the answers in the back of the book
(http://uploads.tapatalk-cdn.com/20170622/8bf5d4d9ea9eb09661b7ff1742c2f2c0.jpg)
Best way to pick up silly mistakes?
Hey! Didn't do General, but I feel like spotting mistakes works the same at any level of Maths study! You'll want to make sure you are moving slowly through the exam (within reason of course). Highlight key terms, put things into your calculator properly and carefully - Try to avoid making the mistake in the first place. Beyond that, to pick up a silly mistake you need to know the ones you usually make. Are you likely to make a mistake in algebra? Try double checking algebra working in the last five minutes. Screw up the interest rate in Credit Card questions? Take 30 seconds to check yourself before you move on from those questions.
You know the saying, "Know your enemy?" That's exactly my advice here ;D
Hi allDid this question come from a paper prior to the syllabus change in 2014? Back then they had a formula to handle the value of an annuity, but it has since been scrapped.
So I am currently prepping for my general maths exam and am stuck on this question. Any help would be appreciated.
Josephine invested $1000 at the end of each year for five years. Her investment earned interest at 4.8% per annum compounded annually. What was the total of Jospehine's investment (to the nearest dollar) at the end of the fifth year?
Thanks :)
Did this question come from a paper prior to the syllabus change in 2014? Back then they had a formula to handle the value of an annuity, but it has since been scrapped.
Yes it has come from a past paper from 2001, but was unsure of whether this was something I needed to know. So is this something i should not worry about or is there now a new way to work it out?
QUESTION:
The hsc marks for a particular course are normally distributed with a mean of 65 and a standard deviation of 8.
What percentage of results lie between 65 and 73?
pls help
Hey, how would I go about solving this question?
Mary is designing a website that requires unique login generation. She plans to generate logins using 2 capital letters followed by a series of numerals 0-9 inclusive, all logins have the same number of numerals, repitition is allowed, what is the minimum number of numerals needed for each login so that Mary can generate at least 3 million logins?
Remark: It's doable with logs but I doubt that's in general so I'd vouch for guess and check as well
hey guys
So i am doing a past trial paper and got stuck on this question.
It has worked solutions as seen in the picture but I still don't understand how each step was reached.. if that makes sense?
I just need some help understanding the question or if there is a simpler way to do this question let me know please! :)
Hey, so I tried this question 2 different ways so far and none of them have worked, so how should I go about this question:I'm not entirely confident of this method (mostly because I didn't actually do general maths), but I believe you should use the arc length formula \(l=\frac{\theta}{360}2\pi r\) (from the formula sheet) to figure out the angle between the two cities. Note that \(l=4356\), and of course \(r=6400 \)
2 cities lie on the same line of longitude and are 4356km apart. One city is located 47 degrees north, what is the latitude of the 2nd city if it is south of the 1st?
This is using the cosine rule
a2=b2+c2+2bc cosA
a = BC, b = AC c= AB
Or in other words a= 90, b = c = x
A= 113ş
That's how they get the first line
From there they just rearrange it. They get all the terms with x on one side (they already are though), all the terms without on another, then they factor out the x2, get x2 as the subject then square root both sides
If you're unsure about the cosine rule, you should brush up on it (don't know what's required for your course though) and if you still need help let me know. Rest is just rearranging the equation to make x the subject
They factorised \(2x^2\) out.
The part where I got confused was where there was 2x squared - 2x squared which in the following line became only one 2x squared and a one in the bracket.
Where did the one come from and since they were like terms would those 2x's minus each other and equal 0?
They factorised \(2x^2\) out.
OMG IT ALL MAKES SENSE!Given that ultimately we had to make \(x\) the subject, it makes sense to isolate \(x\) first. But in that example, we'd have to isolate \(x^2\) as if we factor out just \(x\), we'd only end up factoring it out again.
If I was in an exam though, how would i know that i had to factorise the equation
(I'm super dumb so I really need all the help I can get)
Given that ultimately we had to make \(x\) the subject, it makes sense to isolate \(x\) first. But in that example, we'd have to isolate \(x^2\) as if we factor out just \(x\), we'd only end up factoring it out again.
So we pull out the \(x^2\), and then we pull the 2 out just because it's a common factor. You need to be capable at spotting common factors, as they're the biggest hint to factorise in a rearranging question.
It's also important to look at what you're trying to aim for. If you didn't realise you had to make \(x\) the subject, you wouldn't be able to spot anything.
Hey, any suggestions on how to beat silly mistakes?
Although math is one of my strongest subjects i find the really wordy questions throw me and i end up messing up completely and only afterwards ill realise how simple it was. its super frustrating that silly mistakes drag me down a bit :-\
How do you go about solving 6w^4 X 1/2w^2? I'm having trouble knowing what index law to apply to this
Hey Guys,
I've brought the topic tests book for general maths and was wondering if there was a time limit that we should be using for the tests?
Thanks heaps :)
Anyone know how to asess CSSA General Maths trial papersCSSA papers are copyrighted and legal distribution of it is not permitted. It is also therefore not on the forums.
please help
what amount must be invested now at 4% per annum ,compounded quarterly ,so that in five years it will have grown to $60000
Hey! This is the index law for multiplication, remember:
The constants will be multiplied together separately, and then we use the index law above for the pro-numeral:
Does this make sense? :)
I don't know what is a stamp duty is can someone please help me on answering question I) & ii)
a) Lisa buys a car which has a market value of $60 000 before on-road costs. Stamp duty on the car is calculated at these rates:
• 3% of the market value to and including $45 000
• 5% of the market value over $45 000
I) calculate the stamp duty payable on the purchase of the car
ii) The car depreciates at a rate of 4.5% pa. what's is the value of the car 3 years after Lisa buys it?
Hey! You can imagine that stamp duty is a sort of 'tax' on goods. So, let's calculate it!
We know that stamp duty is calculated at 3% up to and including $45,000, and 5% after that. So, the first $45,000 of the car will be taxed like this:
Now, the car's total cost was $60,000. So, the 'rest' of the car will be taxed ABOVE the lower rate; ie. at 5%. We've already taxed the first $45,000, leaving us with the last $15,000
So, the TOTAL tax will be
Now, the car depreciates at a rate of 4.5% pa. So, after the first year, the value goes DOWN by 4.5%
After the second year, the car goes down ANOTHER 4.5%. So, we multiply the already depreciated value again!
And, then again for a third year!
There's our answer! Hope that made sense :)
Zina opened an account to save for a new car. Six months after opening the account ,she made her first deposit of$ $ 1200 and continued depositing $1200 at the end of each six months period. interest was paid 3% per annum, compounded half yearly . How much was in Zina's account two years after first opening it
please help
What is interpolation and extrapolation?When you have a set of data, you may plot it on a graph and then sketch a line of best fit through it. An interpolation is when you use the line of best fit, to draw conclusion of something within the range of data.
Could someone walk me through how to get the answers to the following questions.It is very off-putting when a ton of questions are thrown at once. In the future, please consider posting lesser amounts, and asking the rest once those have been answered.
1) (http://uploads.tapatalk-cdn.com/20170727/841662dd461e77da78d3e74356468191.jpg)
2) (http://uploads.tapatalk-cdn.com/20170727/7735dcefbb93fbfbe1db1f53853ace84.jpg)
3) (http://uploads.tapatalk-cdn.com/20170727/f043bfd7caba2540e27089b58d85f224.jpg)
4) (http://uploads.tapatalk-cdn.com/20170727/2c8e91570e76115e39ec93c067a922df.jpg)
5) (http://uploads.tapatalk-cdn.com/20170727/34a0353a259d6b2ae5df2aa48338a02b.jpg)
Thank you!!
Could someone walk me through how to get the answers to the following questions.
1) (http://uploads.tapatalk-cdn.com/20170727/841662dd461e77da78d3e74356468191.jpg)
2) (http://uploads.tapatalk-cdn.com/20170727/7735dcefbb93fbfbe1db1f53853ace84.jpg)
3) (http://uploads.tapatalk-cdn.com/20170727/f043bfd7caba2540e27089b58d85f224.jpg)
4) (http://uploads.tapatalk-cdn.com/20170727/2c8e91570e76115e39ec93c067a922df.jpg)
5) (http://uploads.tapatalk-cdn.com/20170727/34a0353a259d6b2ae5df2aa48338a02b.jpg)
Thank you!!
Could someone walk me through how to get the answers to the following questions.(http://i.imgur.com/KcBy8Za.png)
1) (http://uploads.tapatalk-cdn.com/20170727/841662dd461e77da78d3e74356468191.jpg)
3) (http://uploads.tapatalk-cdn.com/20170727/f043bfd7caba2540e27089b58d85f224.jpg)
Thank you!!
(http://i.imgur.com/KcBy8Za.png)
3. Alternatively (good solution E6P though) we could use the graphThey don't use annuity formulae nor have annuity methods. They must read a table that's been given to them.
The graph is saying if you deposit $1 per period at an interest rate of r% per period, what the present value is
We know the interest rate is 4% per year so that means 2% per half year (interest compounded bi-annually)
There are 6 periods (6 half years in 3 years)
So $1 deposited per half-year at 2% per period is worth $5.601. Multiply it by 9000 (the amount deposited per half-year) and you get the same answer D :)
(That being said, I am very much annoyed at how they use "compounded biannually" to represent what's actually "semi-annual compounding". I have no idea where the logic works here.)It's an outdated term, but biannually has its roots in latin. Bi = two, So...... biannually = two times a year =)
It's an outdated term, but biannually has its roots in latin. Bi = two, So...... biannually = two times a year =)The way I interpret compounded biannually is that I see bi as a prefix before the word "annual". So when I see this, I don't think compounded twice per year, but rather once per two years.
Hey guys,So we know sin(ABC)=8/10 = 4/5 from i)
Could you please help with sections 2 and 3 of this question?
Also, might seem like a dumb question but what mode does the calculator need to be on to do the least-squares line of best fit? How do I get on that mode (I'm using the blue sharp calculator)?
Thanks so much!! :)
So we know sin(ABC)=8/10 = 4/5 from i)Thanks so much, that definitely helped with part 3. I'm just a little bit confused, how did you get from the first to the second line of working out for the question (the 6 sin (ABP)/5)
I'm assuming you're supposed to know the sin rule here
iii) You probably have to use a calculator here, using results from i) and ii) to find the angle
Good luck, let me know if you're still struggling with iii) :)
Thanks so much, that definitely helped with part 3. I'm just a little bit confused, how did you get from the first to the second line of working out for the question (the 6 sin (ABP)/5)
Hey guysIf you tried using that form, check that you found m=-1 and wrote down from the graph that b=2. You need to recall what m and b actually mean in that equation
I need help with working out the question... like how do I find the equation of the line?
Used the formula of y=mx+b but still didnt make sense...
Thanks in advance
- y= mx + b
y = equation of a line
m = gradient
b = y intercept
...........
The Y intercept (AKA b) is 2 (where the coordinate is 0,2).. b
Gradient = (y2 - y1)/(X2-X1)
Let point 1 = 0, 2
Let point 2 = 2, 0
m = (0--2)/(2-0) = -1
THerefore, the line... y = 2 - x
...
P.S. You can check your answer and see if it fits properly on the cartesian plane
Hey I'm back with another question
So this one really tripped me up because when I want to find 10% of something I usually times it by 0.1 and get the GST right?
So why is the answer D?
Thanks in advance
Note that if the item cost represents 100% of the price it's to be sold at
and that the GST is 10% of this
Then the cost of the item WITH the GST combined is 110%.
Man I'm on a roll today
But I have an exam tomorrow so want to ask as many questions I need help with as possble.
I don't understand how to make a the subject after i bought r2 across to the other side
Like does the root a a2 cancel out the r2 and I only root the V?
Thanks in advance
why did you then break the square root and put it on the two numbers ?(http://i.imgur.com/ljMVmlI.png)
Hey
So me being me I obviously assume the answer is 30%
So why is the answer 28%
Thanks in advance
Hey
So me being me I obviously assume the answer is 30%
So why is the answer 28%
Thanks in advance
Ok
Moving on I found this question
And before I came to the forum I wanted to see if I could do it myself and after sitting here for half an hour I have had no luck
Please help
Telling me the answer is 8 but I dont know how
Hey Could someone please help me with these questions and let me know which formulas to use. Thanks!
Hey Could someone please help me with these questions and let me know which formulas to use. Thanks!First Q
Hi there, I'm unsure of question 5. The answer is D through 1/13 X1/13 but I don't understand why it can't be 13/52 X 13/5213 is the number of cards in a suit in the deck of cards. So if you wanted to draw, say, two spades, then it would be 13/52 * 13/52.
Thanks!
Hello everyone,
I have my trails tomorrow (I know my school is weird but yea) and I need HELP - anyways I have given up on this probability question so bad rn, so can anyone please help me with it?
In a group of 32 people at a party, 20 are male and of those 2 are vegetarians. A third of the females at the party are vegetarians. A person is chosen at random from those at the party. What is the probability that they ARE NOT A VEGETARIAN?
a). 3/16
b). 3/8
c). 13/16
d). 15/16
Thank you <3
Hello,Let's gather some info.
Also, this one as well.
Lauren owns 400 $3 ordinary shares and 300 $2 preferences shares. The current prices of the ordinary shares and preferences shares are $4.20 and $3.60 respectively. The dividend on the ordinary shares is 55c and on the preference shares is 3%. Calculate total dividend.
My goodness this looks sooooo easy but didn't we have to use the formula Dividend = Dividend Yield x Market Value?Yes.
it is a question from my schools past exam papers, the question is on bearings but there is no solution for me to look at as it is a multi choice question.
need help with a question, its somewhat simple just wanted to know ways to do it easy.
The question is the image below.
need help with a question, its somewhat simple just wanted to know ways to do it easy.Or, alternatively, since they're similar the ratio of the sides is the same
The question is the image below.
Or, alternatively, since they're similar the ratio of the sides is the sameSimilar triangles isn't really easier... they're the same. Saying by inspection we have similar ratios isn't endorsed in any HSC maths course without at minimal, reference to similarity.
CB/15 = 24/16
Or, CB/24 = 15/16
(Yes Rui it can get easier. Also, I think you meant cos instead of sin)
Can u help me with this aswell, i thought it was (B) but its (A) how?
Martine buys stationary which costs $104.50 including GST. Because she works
for a charity she can claim the 10 % GST back from the taxation office. How
much GST can she claim?
(A) $9.50 (B) $10.45
(C) $95.00 (D) $94.05
Help with a question:
A car's petrol consumption (C) in litres/lOOkm can be estimated by using the formula: c=o.01s2 - s+33
where S is the speed (in km/h) at which the car is being driven.
What is the change in petrol consumption if the speed at which a car is being driven increases
from 60km/h to 80km/h?
(A) A decrease of 8 L/100km
(B) An increase of 8 L/100km
(C) A decrease of 17 L/100km
(D) An increase of 13.2 L/100km
Hi!
Hope this helps
A fair coin is tossed 16 times.I am not sure where this is from as this is not taught in the HSC general courses.
a. Find the mean and standard deviation of the number of heads
appearing.
b. Show that the probability of the number of heads lying within two
standard deviations of the mean is approximately 0.95.
Anyone have a solution?
could someone please walk me through how to do simultaneous equations with the elimination method. thank you!The elimination method of solving systems of equations is also called the addition method. To solve a system of equations by elimination we transform the system such that one variable "cancels out" after adding...
Hi guys,
Quick question about the Least Square line of best fit
When i find the gradient for the formula, sometime i would round off to diffrent decimal places then the answers for th standard deviations and amount of decimal places for the gradien
This , as a result, make my final equation slightly out to what the anwers have
If my equation is slightly out but i have shown full working, would i still get full marks and if not how can i ensure i round to the same decismals as the answers will
Thanks
You would almost certainly get full marks as long as it is very close, if you are rounding you should try to take a few extra places than you'll actually need at the end! This will keep things more precise (not rounding at all, where possible, is always the best way) ;D
ok great thanks jamon, for you online HSC holiday video lectures would you be able to do a sction on least sqaure line of best fit ?
Hi,
Is anyone able to help me with this question? (attached)
Thank you :)
Sure! So we've found that \(\frac{20}{110}\) of penguins were tagged on the recapture. That means that, when we initially tagged our penguins, we tagged about \(\frac{20}{110}=\frac{2}{11}\) of the penguins. We initially caught 50 penguins, so our population \(P\) is:
Now we know that this is 13% less than 2012. Meaning, this population is 87% of 2012's population (we'll call this \(X\))!
So, the estimated population in 2012 must have been about 259! You can work it backwards too - Take 13% less than 259 and you get 225, and if you capture 50 out of 225 that is a fraction of 2 out of 11 ;D
Yep :) everything else (reasoning and formulas) are right though
Thanks soo much.
But I think you may have a carried error, shouldn't the 2013 population come to 275 penguins?
Other than that, everything else makes sense.
Thanks soo much.
But I think you may have a carried error, shouldn't the 2013 population come to 275 penguins?
Other than that, everything else makes sense.
So I need help with this question
It's probably easier than what I'm thinking but some guidance would be great
So
What is the product of [8mn/9] and [15/6m] ?
Thanks so much! :)If that's a conversion from megalitres to kilolitres then it is correct
One more question i came across and i just want to make sure i got it right
5.83ML is equivalent to ____________ kL
I wrote 5830kL
Is that wrong?
Thanks again so so much :)Since theres only one number before the decimal point, rounding to two significant figures in this case is the same as rounding to one decimal place. Rounding 5.9723 to one decimal place gives you 6.0.
Another question because why not
The earth has a mass of 5.9723 x 10 to the power of 24kg. Express this correct to 2 significant figures.
How would I go about it?
Since theres only one number before the decimal point, rounding to two significant figures in this case is the same as rounding to one decimal place. Rounding 5.9723 to one decimal place gives you 6.0.
Another way of looking at it is if its asking for two significant figures you look at the third significant figure (in this case 7) and see if it is above or below 5. Then you would change the second significant figure accordingly. So since 7 is greater than five you, the 9 changes to a 0, which changes the 5 to a 6.
Hope this helps
So then would the answer be written as 6.0 x 10 to the power of 24You will most certainly need the power of 24
Or would it just be written as 6.0?
Thanks so much :)
Much appreciate the help everyone :)
next up...
Erica owns 360 shares in a mining company. She paid $2.80 each for the shares and they are valued at $5.40 now. Erica received a dividend of $342
What was the dividend yield on the current market value of the shares?
How would I work out the current market value?
Thank you Rui :) :) :)
Next question for ya....
Strong Credit Union has a credit card that requires a password of 6 digits and one of the letters A, B, C or D at the end. No digit may be used more than once.
How many different arrangements are possible?
Hi.
Can someone please help me with this question? It's from 2016 HSC, and I'm really confused.
27 (b) A small population consists of three students of heights 153 cm, 168 cm and 174 cm. Samples of varying sizes can be taken from this population.
What is the mean of the mean heights of all the possible samples? Justify your answer.
Thank you
Hi!
I need to ask a question from a particular trial paper:
How many files of average size 1.5 MB can be stored on a 16 GB USB drive?
(A) 11
(B) 24
(C) 10 923
(D) 24 576
What i did was convert 16 GB to MB (16384MB) then i divided 16384 by 1.5 MB and got 10 922.66667, so I put C. I checked the answers to see if I got it right but the answers said it was D. They multiplied 16384 by 1.5 to get 24 576.
I tried to find a similar question to it and I did. This was from the 2014 HSC Specimen Paper:
Emma has 16 GB of data storage space available on her computer.
Approximately how many files of average size 7.2 MB can she store?
(A) 450
(B) 461
(C) 2222
(D) 2275
I did the exact same, I divided 16384MB by 7.2MB and got the right answer which was D.
Am I wrong or is this trial question wrong?
Thanks
Hi!Yeah, agree with Jess. That is one critically bad question
I need to ask a question from a particular trial paper:
How many files of average size 1.5 MB can be stored on a 16 GB USB drive?
(A) 11
(B) 24
(C) 10 923
(D) 24 576
What i did was convert 16 GB to MB (16384MB) then i divided 16384 by 1.5 MB and got 10 922.66667, so I put C. I checked the answers to see if I got it right but the answers said it was D. They multiplied 16384 by 1.5 to get 24 576.
I tried to find a similar question to it and I did. This was from the 2014 HSC Specimen Paper:
Emma has 16 GB of data storage space available on her computer.
Approximately how many files of average size 7.2 MB can she store?
(A) 450
(B) 461
(C) 2222
(D) 2275
I did the exact same, I divided 16384MB by 7.2MB and got the right answer which was D.
Am I wrong or is this trial question wrong?
Thanks
Where can I have access to some trail papers?! :) Thank you
THSC :)You're too quick! <3 Thank youu
What is the method of study for maths when I've done heaps of past papers?
What is the method of study for maths when I've done heaps of past papers?
What is the method of study for maths when I've done heaps of past papers?
Heyy, samee but guess what? it is never enough to learn! So what I do is that I'll go back and do ALL of those papers again. I do them until the point that I sometimes even remember the answers to some of the questions!! (this sounds crazy but yea) ;DI've been doing this too! It got to a point where in my final internal assesment I recognised all the questions as past paper questions except a few, and it was my best exam because of it.
Hi there the correct answer is B, could someone please explain how to do this? Thanks! XThis type of question has been removed from the syllabus as of 2014. (Back in the past, they were provided the formula for the PV of an annuity. It has now been removed.)
Questions like this always stuff me up.Hey,
Do I calculate the probability from the total surveyed, or the total number of males surveyed?
Questions like this always stuff me up.On top of what Katie said, it's really about looking out for the wording.
Do I calculate the probability from the total surveyed, or the total number of males surveyed?
Hey,
It's from the total surveyed as the question asks that the person is selected 'from the surveyed group' (which was the total 150 people)
Hope this helps :)
On top of what Katie said, it's really about looking out for the wording.
When the question is given without some kind of "condition", you should anticipate that you're calculating a probability against the entire sample space. (Which is, of course, the surveyed group here.)
If instead, the question read something like "Out of all the males, how many do not own a mobile phone?" then you would have the condition that you're only considering the males. That's when you would divide by 70 and not 150.
Can someone explain to me how to find the upper and lower quartile again for this question i havent done it in a while. please and thank you
Would the answer be 172-136 = 36?what i was wondering i how do i find the ogive again. the answer is correct just forgot how to do it
From what I gathered you just calculate the quartile values straight form the ogive. Not sure if I'm right though..
what i was wondering i how do i find the ogive again. the answer is correct just forgot how to do itThe graph is the ogive.
Do we need to know the volume of a sphere?The syllabus changed in 2013 and in the old formula sheet they give you the formula for the volume of a sphere.
Only the surface area formula is on the sheet and I don't remebr learning it but it's in the 2001 past paper I'm trying to do :(
Hey guys\begin{align*}y&=k-mx\\ y+mx&=k\\ mx&=k-y\\ x&=\frac{k-y}m\end{align*}
So I have a few questions for whoever is lucky enough to answer these...
1. Make x the subject of the formula y=k-mx
Now I get how to do it but in the worked solutions insted of y-k it's telling me it is k-y/m ?
2. Chloe holds a provisional license. Her allowable Blood Alcohol Content (BAC) to drive is zero. She knows that the liver breaks down alcohol at an average rate of 0.75 standard drinks per hour. If she consumed 10 standard drinks from 10pm to 2am what is the earliest time that she could legally drive to work?
A. 11.20 am
B. 11.33 am
C. 3.20 pm
D. 3.33 pm
So since there is no mass I don't know what her BAC is. Am I supposed to work out her weight first and then continue or?
3. Ari borrowed $3340 for a period of 11 months. In total he repaid $4022. The simple interst rate per annum is:
A. 4022-3340/3340x11 x100%
B. 3340/4420x11 x100%
C. 12x(4022-3340)/3340x11 x100%
D. 12x3340/4022x11 x 100%
And finally
Hey there was just wanting to know the difference between frequency and relative frequency for probability?Relative frequency is different in that it is the probability itself. Albeit, the experimental probability.
Thanks heaps!
\begin{align*}y&=k-mx\\ y+mx&=k\\ mx&=k-y\\ x&=\frac{k-y}m\end{align*}
Is that screenshotted question really general math material? Like I know why the answer is B but it feels awkward trying to explain the reasoning for it because i don't know what general math students are taught.Relative frequency is different in that it is the probability itself. Albeit, the experimental probability.
Suppose in 36 dice rolls the number five appeared 5 times. The frequency of five appearing was obviously just 5, but the relative frequency is 5/36.
I was wondering, if I'm ranked 20th in General for my school (ranked 20 out of 77) - Probably around 30 people that do general maths in my school gets pretty bad marks. & I know that general scales badly.. So i was wondering is it still possible for me to get a band 6 if I got 90-100% raw mark for my final HSC exam?
I don't know if this thing is still active but I've come across an issue, I've always learnt to NOT round in the middle of a question in HSC general maths 2, however in doing past papers and going through the BOS answers for said papers I have noticed that they DO round in the middle of a question - so what am I supposed to do? I don't want to get all the answers wrong, but rounding in the middle of a question just seems wrong to me; even though BOS does it... Any help would be appreciated.
Well, I'm not sure how I can effectively convince a general student about it, but...
Thanks for your help! Yes the screenshotted one is a general maths trial question but I feel like I should know how to do it in case it comes up in the HSC ya know ;D
3. Ari borrowed $3340 for a period of 11 months. In total he repaid $4022. The simple interst rate per annum is:Can you please put some more brackets to emphasise what's going on with the fractions? A could easily be interpreted as \( 4022 - \frac{3340}{3340}\times 11 \times 100\text{percent} \) even though you probably didn't mean it like that.
A. 4022-3340/3340x11 x100%
B. 3340/4420x11 x100%
C. 12x(4022-3340)/3340x11 x100%
D. 12x3340/4022x11 x 100%
3. Ari borrowed $3340 for a period of 11 months. In total he repaid $4022. The simple interst rate per annum is:
A. (4022-3340) / (3340x11) x100%
B. (3340) / (4420x11) x100%
C. {12x(4022-3340)} / (3340x11) x100%
D. (12x3340) / (4022x11) x 100%
How to find the correlation coefficient r?? Are we meant to know a formula for that or will it not be in the HSC exam? I was doing a Sydney Grammar Trial paper and it asked to find the correlation coefficient...According to the formula sheet, you can work backwards using the least squares line of best fit.
Just wondering how to know when to use either the simple interest formula or compound interest formula and whats the difference? Unsure when to use which in some questions.I'm pretty sure they will state/hint when to use which. Please provide examples on where the confusion lies.
So A.
(I'm leaving that other question for the time being because I'm not quite sure how to do it either, having not done general. Someone else might get to it before I get back to it.)
Oops, that's my fault.
Thank you so much Rui! Appreciate this so so much! You have no idea how grateful I am for your help!
The answers for this question say it's C ?
Which is why I was confused also
What do you think I should do?
Stick with the answer being A?
can someone explain how to answer this please!
thanks
(http://uploads.tapatalk-cdn.com/20171021/1a2bf40e3ee33728936fea2fe7b7ff65.jpg)
One more question I have for you :(
Sorry for alll the questions
but here it is
Alice was driving her car at 40 km/h through a school zone.
A school student ran onto the road 15 metres in front of her.
If her reaction time is 0.50 seconds and her braking distance was 7.9 metres, was Alice able to stop her car without hitting the child?
Show calculations to support.
I feel so bad for asking so many questions :'((https://i.imgur.com/Ci8g7e8.png)
But I am stuck on how they found the sixty in the angle of ABC
There's no form of alternate angles that would lead me to believe the 60 is formed from that so I really would love some clarification
Thanks in advance
Regards
(https://i.imgur.com/Ci8g7e8.png)
Following this question
they ask how far the ship is from its starting point?
I used the cosine rule and didnt get the correct answer ?
What else can i do?
Following this question
they ask how far the ship is from its starting point?
I used the cosine rule and didnt get the correct answer ?
What else can i do?
Lel this is a stupid question, but is compound interest, annuity, and future value the same thing or?
This should've given \(d=169.12\). What was their answer?
That was the answer they gave but when I put it in my calculator it comes up with 28602.21092Did you remember to square root?
Why is that?
Did you remember to square root?
Hey I have a question from last year's HSC paperP (smoker or male) = P (smoker ) + P (male) - P (smoker AND MALE)
So I keep getting my answer either in the 80s range (so D) or in the 50s range which isn't an option.
The answers say C which if I round my answer up and give a guess is right but I want to know how to get C without having to base it on luck ya know
Thanks in advance
P (smoker or male) = P (smoker ) + P (male) - P (smoker AND MALE)
which equals to....
264/465 + 156/465 - 88/465 = .6845
So practice makes perfect, and its questions like these that get me so worked up.
So i've tried so many different formulas, you name it I probably tried it and didnt get the right answer....
How do I find the bearing of C from B?
:( :'(
(https://i.imgur.com/Qk1cYO6.png)
Could you explain to me how you solved the formula please! I don't mean to be a pain :'(
Thanks in advance
Can someone please help me with this question? :)
So another question
What do you do in this question ...
Like how do you go about it
Hi!
Jamon's already addressed this question here :)
If we use the nPr and nCr calculator functions for probability in the exam what working out do we show? And will we lose any marks?
Hey!Please expand on your problem or provide examples (stating which method(s) you would like help on) for more advice. Some general advice for the time being:
I do the General Math course, and have been struggling with Simultaneous equations. No matter how many videos i watch, and questions i attempt, it just doesnt work out for me! I was wondering if there are any tips etc to get this down pat.
Hey!
I do the General Math course, and have been struggling with Simultaneous equations. No matter how many videos i watch, and questions i attempt, it just doesnt work out for me! I was wondering if there are any tips etc to get this down pat.
2. When they are all linear terms (e.g. \(2x+3y=4\) and \(6x-y=-12\) then you always have a choice of whether you want substitution or elimination.
2. Chloe holds a provisional license. Her allowable Blood Alcohol Content (BAC) to drive is zero. She knows that the liver breaks down alcohol at an average rate of 0.75 standard drinks per hour. If she consumed 10 standard drinks from 10pm to 2am what is the earliest time that she could legally drive to work?
A. 11.20 am
B. 11.33 am
C. 3.20 pm
D. 3.33 pm
So since there is no mass I don't know what her BAC is. Am I supposed to work out her weight first and then continue or?
Ok so not sure if this question has been addressed but if its asking for what amount can be picked out of the jar why id it 4/37 when there is 37 in his hand?
It just confuses me
Hey! Sorry this took a while but I wanted to run it past Steph - This is actually a bit of a trick, because we aren't given the standard info we just use some intuition. We know she starts drinking at 10pm, and can break down 0.75 standard drinks per hour from that point. She needs to break down 10 drinks - This takes:
So if we count forward this much from 10pm, we get 11:20am - The answer should be A ;D
Hi there, just wondering how to calculate monthly repayments? Is there a formula for it?
I think I know the question type you mean, and you are always given an annuities table for an annuities type question. You use the table ;D
Did you have an example of something you are struggling with?
helloThis one was answered quite recently
i need help with this question pls, i am a little confused as to working this out
thanks :) :D
Hi.... :D
This is probably a dumb question but i can't understand why the answer for Q4 in the 2012 General Maths HSC Paper is A? I got B and can't quite figure out why it is B... here is the link to the paper... it is Q4 and is about the expression used to calculate the value of x in the particular triangle...
https://www.boardofstudies.nsw.edu.au/hsc_exams/hsc2012exams/pdf_doc/2012-hsc-exam-general-maths.pdf
Thanks heaps... very much appreciated!!!!!!!....
Hi.... :D
This is probably a dumb question but i can't understand why the answer for the attached question is A? I got B and can't quite figure out why it is A...
Thanks heaps... very much appreciated!!!!!!!....
So how would I find the value of A in this instance?
Like I tried making A the subject but that wasn't so successful so what should I do?
Thanks in advance
From the graph, you can see that when x(days)=0, the Mass is 1.5. You would sub these into the equation and then solve for A. ;)
From the graph, you can see that when x(days)=0, the Mass is 1.5. You would sub these into the equation and then solve for A. ;)
hello
how do i figure the IQR out pls help
thanks
Is Medicare Levy, tax deductible?
i am having trouble with this can you help pls!!
this question is from last yrs paper,
thanks
here is the question from above for the marshmallow one
sorry pls explain further?
but then how would I find the daily growth rate of the pig?
Like is there a formula or something coz the answers literally just give me the answer
but then how would I find the daily growth rate of the pig?
Like is there a formula or something coz the answers literally just give me the answer
here u r
hello
i need help with this too? pls
thanks
Hey there, question do we have to remember the different dosage formulas for children and adults?
Thank you
Hey! ;D
i find probability really confusing in this course... especially trying to work out what technique as such to apply and when...
so... is nPr applied to unordered data as such... eg) something that can be used more than once.... and nCr used when things can only be used once... eg) selecting people for a committee?
sorry... that possibly made no sense??! :o
Welcome to the forums! I instead like to think of it as:
- nPr is when order does mattter
- nCr is when order doesn't matter
For example, if there are 10 people and I'm selecting 5 for a committee, then that can happen in 10C5 ways. But if I'm, say, voting for 5 of them in order of preference (order matters), it would be 10P5 ways.
In general, you can always choose the things only once, but it's whether you care about the order when you are done or not that determines which you use ;D
Can someone help me out with this question and explain it thoroughly cause standard deviation is where I always go wrong. Thanks
(http://uploads.tapatalk-cdn.com/20171022/a9169f2ff537fb5bb625786c1a24e7e0.jpg)
Hey... is anyone able to help me out on how to go about this question? ???
it refers to the question before which just states what is found in a deck of 52 cards... 4 suits, each suit has 9 numbers, one ace, and a jack, queen and king...
MANY THANKS!
Sure! So the dimensions of that big prism of marshmallows can be found by clever adding of the dimensions, it is 20cm by 15cm by 6cm, see if you can spot how they line up. The volume is:Wouldn't that include the 'gaps' outside the marshmallow cake (but within the rectangle) where the chocolate doesn't go?
But that's counting the gaps as well - The volume of the marshmallows is just the 24 times the volume of the cylinder. Remember the radius is half the diameter:
Multiply by 24 to get the total marshmallow volume:
And the difference between the two is your answer - The gaps where the chocolate will go ;D
Wouldn't that include the 'gaps' outside the marshmallow cake (but within the rectangle) where the chocolate doesn't go?
Area of one of the chocolate bits = area of one of the 5x5 squares - area of one circle (as there are four quarter-circles per 'square')
= 5*5 - π*2.52 = 5.365 cm2
Volume of one of the chocolate bits = area*height = 5.365*6 = 32.19 cm3
Volume of all 6 chocolate bits = 6*32.19=193.1 cm3
Alternatively, you could just halve the answer Jamon got, as that would be the volume of 12 of the chocolate bits instead of 6 :)
Hello there, can someone please help me with these questions? I never quite understood random samples and how to use them to solve questions😅 - like how do i generate random numbers on my calculator? *question b onwards 😊 ()
A random sample is just a way to guess stuff about your population using a small, randomly selected subset. EG, guessing the average height of all 20 year old males by looking at the height of a few 20 year old males.
Take a random sample of \(n=5\) to be the top 5 people in that table. Persons 1-5. It could be any five people!
Of those 5, 2/5=40% drive a car, 2/5=40% catch a bus, and 1/5=20% walk. This is data from our sample, and if we compare it to the total percentage for the population:
20% walk
40% drive
40% bus
It is actually identical - So in this case, our sample does a fantastic job as an estimate, we got lucky! But different samples will be slightly less effective, purely based on chance ;D
Ahhh that's makes so much more sense, thank you so much ! For some reason I always thought it was something more complex 😅
Hate when things get over-complicated! Glad I could help - Good luck in your exam tomorrow (if you are in Year 12, aha) ;D
Hey
So this is probs easier than I think it is but I think my mind is turning off and just doesnt want to work anymore but I'm pushing through ahahah
:o
Anyway, how would i find the distance for this
BTW soz for that TMI
Hey! So the angle of depression is 42 degrees, but that appears ABOVE the line in the triangle. The way this works though is that the 42 degree angle of depression appears in the bottom angle of the triangle, at the buoy - Is this something you are familiar with happening?
If so, it is easy. Use the tan ratio (SOHCAHTOA!):
Multiply by \(d\):
Then divide by tan and calculate:
Does this help? :)
Yes this helps so so much!
Honestly don't know how I didn't remember this
Gosh really hope my brain is on the ball tomorrow
THANK YOU SO SO MUCH! LIFESAVER :) :D
Stay relaxed, underline key terms in the question - It will come to you as you need it! Good luck! ;D
How do we calculate the correlation coefficient? I've tried to find it in my textbook but i've had no luck
Another question that's popped up401 is the answer =)
A camera costs $449, including 12% GST.
What is the price of the camera without GST, correct to the nearest dollar?
(A) $395
(B) $401
(C) $437
(D) $503
PLEASE HELP :'(
Another question that's popped up
A camera costs $449, including 12% GST.
What is the price of the camera without GST, correct to the nearest dollar?
(A) $395
(B) $401
(C) $437
(D) $503
PLEASE HELP :'(
Hey i have a question from the 2016 HSC paper its question number 25 there is a diagram given but i cant figure out whether it has attached so there is a link to the paper bellow aswell.
thanks in advance
25) The diagram shows towns A, B and C. Town B is 40 km due north of town A. The
distance from B to C is 18 km and the bearing of C from A is 025°. It is known that BCA
is obtuse.
What is the bearing of C from B?
(A) 070°
(B) 095°
(C) 110°
(D) 135°
http://educationstandards.nsw.edu.au/wps/wcm/connect/06a68d63-e1aa-4616-b0fe-5144a7a8ed0d/2016-hsc-maths-general-2.pdf?MOD=AJPERES&CACHEID=ROOTWORKSPACE-06a68d63-e1aa-4616-b0fe-5144a7a8ed0d-lCpNxTo
Generally its calculated from a range of data with x and y variables.... which is where the calculator come handy... this is just how i have learnt to do it :D... so basically with the x and y data.. enter it into the calculator (on stats mode, select 2: (a+b X)- gives you a table)
and once you have entered in the data press AC then shift 1, then 5 (reg) then 3 (r)... somewhat of a process.... ??? but that should do it... :)
ATB
Hey i have a question from the 2016 HSC paper its question number 25 there is a diagram given but i cant figure out whether it has attached so there is a link to the paper bellow aswell.
thanks in advance
25) The diagram shows towns A, B and C. Town B is 40 km due north of town A. The
distance from B to C is 18 km and the bearing of C from A is 025°. It is known that BCA
is obtuse.
What is the bearing of C from B?
(A) 070°
(B) 095°
(C) 110°
(D) 135°
Hey I just did my General Math HSC exam and i was wondering if the question was 'Calculate the volume of the cone' and it had a sphere on top with the bottom of the sphere entering part of the cone, and in my answer i had the working out for the height to use in the formula for the cone, and the 'Volume of the cone with part of the sphere' and 'Volume of the cone without part of the sphere' beacuse I didn't know what they meant. Would they mark me down for going a step further for stating 'volume of the cone with part of the sphere' or just be able to neglect it and not get marked down?
Unfortunately you may lose a mark or two, but it really depends on the marking criteria they develop. What was your final answer?
Hey... i also just sat the general maths exam.... for the last question i just found the volume of the cone regardless of the sphere sitting in a bit... the sphere was just there to help find the dimensions of the cone.... so my final answer was 113 cubic cm...!
I didnt get to finish but the 'v of the cone without part of sphere' working out was on the extra writing space - except I hadn't rounded off the 'v of the cone with part of sphere' (what they were looking for) because i was going to round off at the end
So if it was 3 marks, would I only get 1 mark?
Hey... i also just sat the general maths exam.... for the last question i just found the volume of the cone regardless of the sphere sitting in a bit... the sphere was just there to help find the dimensions of the cone.... so my final answer was 113 cubic cm...!
Did anyone else get anything similar..??
Yeah. i got 113 cm^3.yep that's it... i asked our maths teacher after the exam and he has seen the paper... and he said that sounded right... so hope for the best..!!
I sense you used pythagoras and used the height of the cone as 9 as I did?
Hey, i did all the working out to find out 113cm (cubed) (volume of the sphere), unfortunately i overthought it and tried to minus the hemispshere in the cone. how many marks could i expect to lose?I'm not totally sure... it depends on the marking criteria!
Hi, I'm doing a question;
For a reducing balance loan of 180000 at 9% over 12 yrs, with fortnightly repayments of 932.75, find;
a. Total interest payable
b. The equivalent flat rate of interest annually
I was wondering if theres a method to calculate total interest payable (for a) without manually drawing out the whole table? In this case, you would have to draw 312 rows (12x26 fortnights) and I swear that's not the most efficient way, but the textbook doesnt mention anything otherwise.
And I'm just at a complete loss as to how you would do b
Hi, I'm doing a question;
For a reducing balance loan of 180000 at 9% over 12 yrs, with fortnightly repayments of 932.75, find;
a. Total interest payable
b. The equivalent flat rate of interest annually
I was wondering if theres a method to calculate total interest payable (for a) without manually drawing out the whole table? In this case, you would have to draw 312 rows (12x26 fortnights) and I swear that's not the most efficient way, but the textbook doesnt mention anything otherwise.
And I'm just at a complete loss as to how you would do b
Hey! Just clarifying on Huss' answer above:yeah i just noticed i forgot to subtract after i read the question again i edited it and i said i was missing the R
- For (a), you need to subtract the principal from that final answer to get interest payable. So the answer to (a) is actually that number $111,018 :)
- And just clarifying for (b), it is \(R\) you are making the subject of the formula, which is:
Substituting those values as Huss has shown you will get you the answer :)
Two simple suggestions:
Use a highlighter.
Copy out valuable pieces of information CLEARLY stating what it is on the SIDE.
Hi! Some people from my class told us that you can only use a pink highlighter in the HSC exams. Is this true? Thanks :)Never heard of that rule before. NESA doesn't specify anything regarding the colour either
Never heard of that rule before. NESA doesn't specify anything regarding the colour either
Cool, thanks. :) Because they said that they only allowed pink as it's the only colour they are able to see when scanning the papers.When I did the HSC just a few months ago our supervisor told us not to mark the paper with any highlighters or any implement other than a black pen so....
Cool, thanks. :) Because they said that they only allowed pink as it's the only colour they are able to see when scanning the papers.If you're unsure it might be a good idea to send them an email. To be fair, they did change their scanning system quite recently (idk why though, it was for the WORSE if you ask me) so no guarantees that things that were ok are still ok. Plus you never know if they update their website.
When I did the HSC just a few months ago our supervisor told us not to mark the paper with any highlighters or any implement other than a black pen so....That would literally contradict the website itself, which is really odd.
Hey, is there a way to calculate the interquartile range without writing/ordering every single number on paper? Like, say there were 200 numbers, is there a proper formula for this?
Now that the website is back online...Yes. Keep in mind that maths is different to every other subject in that the preliminary course is EXAMINABLE. Up to 20% of the final exams are allowed to include content taught in the preliminary course.
Anything goes in maths. All of it is in play.
I NEVER KNEW THIS. I dropped to general at the start of year 12, and I guess now I’m just realising the immense workload I must catch up with - that is, all the prelim content I never learnt. Why math gotta do peeps who drop down like this smh :'(It'll be ok, I did the same, and since the HSC content is mostly an extension of the prelim content you won't have to work too hard to catch up if you've got a solid understanding of the HSC content, which, from mathematics 2U I guess you do. A lot of it's pretty easy, the only things I remember having to distinctly go over because I didn't already know them from yr10 and below, is the yr11 case studies and some of the financial stuff, but other than that going over the whole course isn't super nessecary
Hey Guys,The linear function must take the form \(y=mx+b\), meaning only y’s and x’s appear. The only plausible option is B, which is \(y=-x+12\) rearranged.
If anyone could please explain this question and what exactly is a linear function is and how to identify one
Thanks in advance!
Hey Guys,
I have my half yearly coming up next week and the topics being assessed are:
1. Loans and Annuities
2. Equations and Linear Functions
3. Further Applications of Area and Volume
4. Statistical Distributions
I have completed all my school's past papers and topic tests given by my teacher. If anyone can send me or let me know of any past paper resources or topic tests on the topics above that would be awesome!
Thanks!
Hey Guys,
I have my half yearly coming up next week and the topics being assessed are:
1. Loans and Annuities
2. Equations and Linear Functions
3. Further Applications of Area and Volume
4. Statistical Distributions
I have completed all my school's past papers and topic tests given by my teacher. If anyone can send me or let me know of any past paper resources or topic tests on the topics above that would be awesome!
Thanks!
I NEVER KNEW THIS. I dropped to general at the start of year 12, and I guess now I’m just realising the immense workload I must catch up with - that is, all the prelim content I never learnt. Why math gotta do peeps who drop down like this smh :'(
Hey, for this question, do I calculate the cumulative frequency based on the first 163 or the last one?The last.
Hey, for this question, do I calculate the cumulative frequency based on the first 163 or the last one?
The last.Thankyou!!
The cumulative frequency is intended to be a running total of all the frequencies, so every instance of 163 must count as well. Therefore 10 is correct.
Okay, so this is the solution on the answers for a past trial paper I've been doing, but I swear to god it's wrong - or I'm just really stupid. Can someone please confirm? My answer is waaay off this, and I swear I haven't done anything wrong because I've gotten the same answer three times. I don't understand why they've minused the a and the b when the formula clearly states you're supposed to add them?
I’m actually confused. How do you calculate the cumulative frequency from a stem and leaf plot?The numbers less than or equal to 163 in that stem and leaf plot are
Okay, so this is the solution on the answers for a past trial paper I've been doing, but I swear to god it's wrong - or I'm just really stupid. Can someone please confirm? My answer is waaay off this, and I swear I haven't done anything wrong because I've gotten the same answer three times. I don't understand why they've minused the a and the b when the formula clearly states you're supposed to add them?Presumably, the area enclosed by the trapezium but excluding that triangle was meant to be shaded. Judging by the quality of the picture, it looks like that the shading disappeared when the image got scanned.
Can someone please help me with the last 3 of question 8? I am literally lost. The answers are;
c. 9/100
d. 0.066
e. 0.624
I need working out aswell, because I literally have no clue how they've ascertained such answers and my exams are tomorrow.
Thankyou so much!!
_________________________________________________
Can someone please help me with this question\begin{align*}A&=\pi r (r+s)\\ \frac{A}{\pi r}&= r + s\\ \frac{A}{\pi r} - r &= s\end{align*}
\begin{align*}A&=\pi r (r+s)\\ \frac{A}{\pi r}&= r + s\\ \frac{A}{\pi r} - r &= s\end{align*}
\[\therefore \boxed{s = \frac{A}{\pi r} - r} \]
Thank you soo much!
Just one more question, is there a 'rule of thumb' in regards to what you must do first when changing the formula of a subject.? (in a particular order)
Hi,(May need to click on the image.)
Could someone please help me with this question? I asked my teacher but I still don’t understand it : (.
“James walked 2.8 km due west of home, then turned and walked on a bearing of 296° until he was 4.9 km from home. What is James’s bearing from home?”
The answer is 281°, but I keep getting 303° SMHH.
(May need to click on the image.)
(https://i.imgur.com/EkGlefe.png)
15 and 16 please!
15 and 16 please!
If you are doing ordered combinations, you can make your life easier by using the permutations function on the calculator (shift, multiplication sign). If you are doing unordered combinations you can use the combinations function (shift, divide sign).Whilst this is true, I don't think this is relevant for the questions provided. They don't involve selecting a certain amount of people out of a group for something here, they're just arranging every person present into positions.
The reason why it makes no difference is because we haven't specified any conditions on who sits at the front or who sits at the back.
_________________________________________
2d? I swear I've done it the same way that the example has but my answer is completely off lol. Thank you!!You should be able to consider the complement for this one. The opposite of winning at least one prize is winning no prizes.
You should be able to consider the complement for this one. The opposite of winning at least one prize is winning no prizes.Oo I got it, thankyou so much man!! I never thought of it that way haha. Thanks again.
So just do 1 - your answer from c).
(Otherwise, you need to add the probability of winning only 1st prize, or winning only 2nd prize, or winning both)
-------------------------------------------------
Having said that, if you want to compare it to the original example, please post that one up as well
Hi, I’m not sure if this is a stupid question but it’s annoying me.Can you post the full question so that I have something more concrete to refer to?
In Mathematics and Health, in the Least-squares regression line questions, I don’t understand how when you find the equation of the line, the y-intercept is completely different from the actual y-int on the line on the scatter plot. Like my textbook shows a line which has its Y-int at 4.84 (on the graph) but the equation for THAT line is ‘y = -0.1357x + 276.82’.
And when you do the working out the that equation is correct but IT DOESNT MAKE SENSE IF ALL THE VARIABLES ARE NO WHERE NEAR THE Y-INT. ugh. I asked my math teacher and he had no idea, so if someone understands this please help. Exam next week, thaank you! :’)
Hello, :)The answer to the first question is pretty much on the formula sheet
Just a few questions about questions that i have about some data and scatter plots i have done for mathematics and health...
The questions are:
What does the gradient mean for each set of data?
Describe any correlation between the 2 variables for each of data.
For which group of countries (developed/developing) do you think Government spending on health has a greater impact on life expectancy?
Soo...what exactly should i include in each question? They are all worth 2 marks each.
Sorry if it doesn't make sense... ::)
Chrz.
Hello i have no idea how to answer this question:
Francis is to be administered 3000mg of medication through an IV drip. The solution through which it can be administered comes in two forms, 50mg per 5mL or 8mg per 5mL. In either case the drip will be delivered at a rate of 20 drips per minute and there are 5 drips per mL. Calculate how much quicker the stronger solution will take to deliver the 3000mg of medication.
Thanks...
hey guys i might need some help with a question too. Part c im not getting the ans is S=0.9275M + 8.0041The answers are using \(T\) and \(H\). Where are you getting \(S\) and \(M\)?
Hi all,Well, if we include ordering then your events are KK, KQ, KJ, QK, QQ, QJ, JK, JQ, JJ (9 events), and they're all equally likely. So the probability of QQ is just 1/9, so when you multiply that by 45...
This question was in my task 3 exam on Wednesday and has been racking my brain the past couple of days!! Someone help me out here pleaseeeee
'Three cards, 'K, Q, J' are faced down on a table.
One card is selected at random and replaced.
A second card is selected at random and replaced.
This experiment is repeated 45 times, what is the expected number of getting 2 Queens.'
I think in the exam I came to the conclusion of 5 but I have no idea how I got it or if it's right.
So the probability of QQ is just 1/9, so when you multiply that by 45...5!! Cheering!
I don’t know how to answer this question, could somebody please help? The answer is 64.
Hii, I'm really stuck on these 2 probability questions. Any help at all would be greatly appreciated!!Q9 is probably best done by listing, as far as the General course goes:
Hey,
How am I supposed to do the second question? Lol I feel like it's probably really obvious but I legit have been staring at it aimlessly for the longest time. I think the diagram is just kinda confusing
I feel like I've tried everything with this question, I looked at the answer and tried to work backwards too... Someone help a sister out plsAt first glance I don't seem to get any of them actually...
(Answers say B)
At first glance I don't seem to get any of them actually...
I get an answer of \(-1.41\).
That's what I kept getting too ???, I thought I was going crazy or somethingWell if we're both getting the same "wrong" answer I think we should assume that the question is wrong. :D
Hello,
Just need some help on the below questions from last years HSC...
A set of data has a lower quartile of 10 and an upper quartile of 16.
What is the maximum possible range for this set of data if there are no outliers?
Recall from the formula sheet that outliers occur
if their score is less than
Q
L
−
1.5
×
I
Q
R
, which in your case is
10
−
1.5
×
6
=
1
or if their score is greater than
Q
U
+
1.5
×
I
Q
R
, which is
16
+
1.5
×
6
=
25
Hi,
In typical questions such as “Calculate the area of the annulus” where the question doesn’t specify “correct to the nearest metre” or something like that, what are we expected to round up to? Is it alright to round to 2 decimal points and add “(2 d.p.)” at the end?
Yes certainly! I've been doing that all the time and haven't lost a single mark for that. 2 dp should be the most appropriate.
need help with this math question ;)
A motor bike is moving at a steady speed. When the speed is 90km/h the bike consumes 5 litres of petrol for every 100 kilometres travelled.
a) the petrol tank holds 30 litres. how many kilometres can the bike travel on a full tank of petrol when its speed is 90km/h?
b) when the speed is 110km/h the bike consumes 30% more petrol per km travelled. calculate the number of litres per 100 kilometres consumed when the bike travels at 110 km/h.
Well if we're both getting the same "wrong" answer I think we should assume that the question is wrong. :D
help with this question 8)
The three sides of a triangle are in the ration 1:3:5. The longest side of the triangle is 16.2 mm. What is the perimeter of the triangle?
Help with attached question pleeasse :)
danke...
“The inverse operation to exponentiation is logarithms, and as exponents aren't commutative like addition and multiplication are, there are two possible inverses, the other being surds.\(y=2^x\) is an exponential, and you would get the inverse by placing the \(y\) where the \(x\) is.
Hi, I'm not too sure if this is where I can ask this, if it's not if someone could redirect me that would be great!It's a trap in the wording.
It's a standard maths question:
"Calculate the future value, to the nearest cent. a) Present value of $680 invested for 4 years at 5% p.a. compounded biannually"
the answer in the book is $828.51 (Cambridge maths book)
This is what I did and if someone can spot the flaw please let me know!!
P = 680
r = 10%
period = 2
Thankkss!!!!
Hi everyone!!
I was wondering if anyone could help me with explaining bearings (true, compass etc.). I've been confused for the past few days about it and i was hoping for some clarification!
Thanks :o
Ok sweet.
Just 1 thing did you mean (-1,0) rather than (-1,-8)?
Hi I'm having a bit of trouble wrapping my head around percentage error/measurement type questions (I know they are practically easy) but for example what would be the absolute error of the number 5.54mm. the formula sheet has 1/2 x precision but how do I find the precision? is it just .05 and then i half that to find the absolute error. so then if i have a number 7.89 the absolute error is the exact same? i think that is what I don't understand.The precision is basically just how far you go with decimal points. If your measurement is 5.54mm, then they are precise up to the nearest 0.01mm. So the absolute error is then one half of this, i.e. 0.005mm.
I get how to find the percentage error of the number but when I type it in to my calculator how do I know where to round off the percentage?
Hope this all makes sense :) :)
I've been doing some past papers and questions which always come up are those with combinations etc. Was this part of the old syllabus or do I have to know this because I have never done these in class or seen the formulas which are shown in the answers.
I think you're referring to probability? For example, you would find questions like: 'A bag contained 4 blue marbles, 3 red marbles and 2 green marbles. If Bob drew one marble and then drew another one. What is the probability that he will draw two marbles of the same colour?'
If this is the type of question you are talking about and you are having trouble understanding it or solving it, I would recommend revising it and asking for help from your math teachers. There are also papers you can find online with worked examples that can help you work closely on a specific subject as such. Probability is part of our current syllabus so it would definitely be worth revising before your final exams. Good luck! ;)
Hey People,The difference is really in what a sample is. The population standard deviation is the actual standard deviation. 'Population' refers to every object that you have.
Just a quicky.
Should i use 'sample' or 'population' standard deviation when they just ask for 'standard deviation'?
Also, it may be beneficial if some1 could tell me the difference!
Thanks everybody
Another question ;D ;D ;DThere's actually a Wikipedia article on this. It's a very famous statistical concept.
Why doesn't correlation imply causation?
It is simple but i am getting very muddled! i.e. why, doesnt the data prove just that?
As ice cream sales increase, the rate of drowning deaths increases sharply.
Therefore, ice cream consumption causes drowning.
This example fails to recognize the importance of time of year and temperature to ice cream sales. Ice cream is sold during the hot summer months at a much greater rate than during colder times, and it is during these hot summer months that people are more likely to engage in activities involving water, such as swimming. The increased drowning deaths are simply caused by more exposure to water-based activities, not ice cream. The stated conclusion is false.
Hey people
Struggling with this!
Any suggestions?
hi everyone,I just tried part a and I obtained the exact same network, with the exact same EST and LST times. So I think you should be all good.
I'm really stuck on this question about network diagrams. I tried drawing one out but I'm not too sure if my diagram is correct. For part b, I don't see how changing (I) will affect (J), so could someone please lend a hand?
thank you!
I thought I had to use the polygon degree formula. And for some reason why head went blank about what the cosine rule was called. ;D