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March 29, 2024, 04:21:12 am

Author Topic: Mathematics Question Thread  (Read 1296806 times)  Share 

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Phillorsm

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Re: Mathematics Question Thread
« Reply #75 on: May 08, 2016, 09:35:06 pm »
+1
No worries Jake, yeah I used your method and was able to get a solution I believe to be right. You had the right idea, just missed one little thing. No problem, HAPPY BIRTHDAY BY THE WAY!

jakesilove

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Re: Mathematics Question Thread
« Reply #76 on: May 09, 2016, 10:25:06 am »
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No worries Jake, yeah I used your method and was able to get a solution I believe to be right. You had the right idea, just missed one little thing. No problem, HAPPY BIRTHDAY BY THE WAY!

Thanks Phillorsm! Appreciate it :)
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Phillorsm

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Re: Mathematics Question Thread
« Reply #77 on: May 09, 2016, 02:55:56 pm »
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No problem Jake, another question for you. I can do up to part iii, but part IV I am stuck.
https://goo.gl/photos/wTkpMHqM6dVkFfSr7

jakesilove

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Re: Mathematics Question Thread
« Reply #78 on: May 09, 2016, 03:13:06 pm »
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No problem Jake, another question for you. I can do up to part iii, but part IV I am stuck.
https://goo.gl/photos/wTkpMHqM6dVkFfSr7

There ya go! Just think about what you need to find, use some random triangle to try and get the answer out!



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Phillorsm

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Re: Mathematics Question Thread
« Reply #79 on: May 10, 2016, 05:17:15 pm »
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Hey Jake, wondering if we could revisit this question. For the final part, (the tan inequality) I seem to be getting different results from different places. The one I am currently thinking is correct is -pi/2<=x<=-3pi/8, -pi/4<x<=pi/8, pi/4<x<=pi/2
https://goo.gl/Hg97px

RuiAce

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Re: Mathematics Question Thread
« Reply #80 on: May 10, 2016, 06:30:43 pm »
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Hey Jake, wondering if we could revisit this question. For the final part, (the tan inequality) I seem to be getting different results from different places. The one I am currently thinking is correct is -pi/2<=x<=-3pi/8, -pi/4<x<=pi/8, pi/4<x<=pi/2
https://goo.gl/Hg97px

Refer to my post on the previous page. I have already addressed this stating that yes that IS the solution, except for one thing.

pi/4<x<pi/2

x can't equal to pi/2

Maz

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Re: Mathematics Question Thread
« Reply #81 on: May 10, 2016, 10:15:32 pm »
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hey
can someone please explain how to do this question for me?
Q: Police set up a road block to check cars for seatbelt use. From experience, they estimate that 80% of drivers wear seat belts. Use this estimate to determine what the probability is that the second unbelted driver is in the 8th car stopped?

there is a second part of this question that i know how to do...but i don't know how to do this part..
any help will be much appreciated  :)
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RuiAce

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Re: Mathematics Question Thread
« Reply #82 on: May 10, 2016, 10:27:45 pm »
+1
hey
can someone please explain how to do this question for me?
Q: Police set up a road block to check cars for seatbelt use. From experience, they estimate that 80% of drivers wear seat belts. Use this estimate to determine what the probability is that the second unbelted driver is in the 8th car stopped?

there is a second part of this question that i know how to do...but i don't know how to do this part..
any help will be much appreciated  :)






jakesilove

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Re: Mathematics Question Thread
« Reply #83 on: May 10, 2016, 10:28:02 pm »
+1
hey
can someone please explain how to do this question for me?
Q: Police set up a road block to check cars for seatbelt use. From experience, they estimate that 80% of drivers wear seat belts. Use this estimate to determine what the probability is that the second unbelted driver is in the 8th car stopped?

there is a second part of this question that i know how to do...but i don't know how to do this part..
any help will be much appreciated  :)

Hey again!

My solution is below. Essentially, you need to break up the question into its constituent parts (first, 1 in 7 drivers, then, 8th driver), find the probability of each part, and multiply them together :)



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jakesilove

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Re: Mathematics Question Thread
« Reply #84 on: May 10, 2016, 10:29:10 pm »
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ATAR: 99.80

Mathematics Extension 2: 93
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RuiAce

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Re: Mathematics Question Thread
« Reply #85 on: May 10, 2016, 10:30:12 pm »
+1
Looks like Rui beat me too it :)

Ninjas. Ah sorry :)

But yeah I basically also considered the binomial probability distribution. I just didn't exactly apply it since this question wasn't posted under the Extension 1 section of the forum.

Maz

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Re: Mathematics Question Thread
« Reply #86 on: May 10, 2016, 10:47:27 pm »
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Ninjas. Ah sorry :)

But yeah I basically also considered the binomial probability distribution. I just didn't exactly apply it since this question wasn't posted under the Extension 1 section of the forum.
Looks like Rui beat me too it :)

thank you both of you :)
i am doing binomial distribution but since I'm on the opposite side of the country as you guys i didn't know where to put which question :)
sorry  ???
but thank you again :)
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jamonwindeyer

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Re: Mathematics Question Thread
« Reply #87 on: May 11, 2016, 12:01:06 am »
+1
thank you both of you :)
i am doing binomial distribution but since I'm on the opposite side of the country as you guys i didn't know where to put which question :)
sorry  ???
but thank you again :)

All good! 2 Unit students in NSW can do this question with their knowledge anyway, just a little more difficult than it would be for yourself or a NSW Extension 1 student  ;D

jamesq

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Re: Mathematics Question Thread
« Reply #88 on: May 13, 2016, 11:19:39 pm »
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A man takes out a $250 000 mortgage. Interest is 7.2% per annum, compounded monthly. Repayments are $3 000 monthly.
a) Find a formula for the balance on the loan after n months
b) How many years does it take to repay the loan
Thank you!
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RuiAce

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Re: Mathematics Question Thread
« Reply #89 on: May 14, 2016, 10:05:38 am »
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A man takes out a $250 000 mortgage. Interest is 7.2% per annum, compounded monthly. Repayments are $3 000 monthly.
a) Find a formula for the balance on the loan after n months
b) How many years does it take to repay the loan
Thank you!





« Last Edit: May 14, 2016, 11:22:40 am by jamonwindeyer »