July 12, 2020, 12:50:16 am

### AuthorTopic: HSC Maths Advanced - 25/10/19 - Discussion, Questions & Potential Solutions  (Read 4493 times)

0 Members and 1 Guest are viewing this topic.

#### Joseph41

• Great Wonder of ATAR Notes
• Posts: 10214
• Oxford comma, Garamond, Avett Brothers enthusiast.
##### HSC Maths Advanced - 25/10/19 - Discussion, Questions & Potential Solutions
« on: October 09, 2019, 04:17:51 pm »
Post all exam discussion, questions, and sample solutions for Maths Advanced here!
« Last Edit: October 09, 2019, 04:27:24 pm by Joseph41 »

#### lace02

• Posts: 17
##### Re: HSC Maths Advanced - 25/10/19 - Discussion, Questions & Potential Solutions
« Reply #1 on: October 25, 2019, 07:15:14 pm »
How did everyone go?!

#### KingTings

• MOTM: JULY 19
• Forum Regular
• Posts: 61
• "I'll do it later.."
##### Re: HSC Maths Advanced - 25/10/19 - Discussion, Questions & Potential Solutions
« Reply #2 on: October 25, 2019, 07:16:06 pm »
How did everyone go?!

I didn't think it was too bad, yourself?
I made dumb mistakes throughout a bit of 14-16, but overall I'm hoping for around 90ish raw.
What does everyone thing the b6 cutoff and scaling will be like this year?

Someone already put up the paper lol
« Last Edit: October 25, 2019, 08:12:00 pm by KingTings »
HSC 2019

ATAR:
Aim = 92+, Actual = 97.1

#### RuiAce

• ATAR Notes Lecturer
• Honorary Moderator
• Great Wonder of ATAR Notes
• Posts: 8745
• "All models are wrong, but some are useful."
##### Re: HSC Maths Advanced - 25/10/19 - Discussion, Questions & Potential Solutions
« Reply #3 on: October 25, 2019, 08:17:51 pm »
Note: If NESA requests this to be taken down, I'll be forced to comply. Juggling MX2 alongside this. Please point out any mistakes.

(Click on an image to resize it!)

Questinos 11, 12 and 14 kindly donated by fun_jirachi

Multiple choice

Question 13

Question 15

Question 16

« Last Edit: October 26, 2019, 09:59:31 am by RuiAce »

#### KingTings

• MOTM: JULY 19
• Forum Regular
• Posts: 61
• "I'll do it later.."
##### Re: HSC Maths Advanced - 25/10/19 - Discussion, Questions & Potential Solutions
« Reply #4 on: October 25, 2019, 08:27:36 pm »
Note: If NESA requests this to be taken down, I'll be forced to comply. Mostly gonna go backwards for now, but I'm also gonna juggle MX2. Please point out any mistakes.

Question 16

Thanks so much Rui!!!

For 16 b, would the height be pi/4 or pi/2? And hence it would be pi/12(y0 + ylast 4yodd) ? cause I got 1.53 rip pls tell me I didn't make a big oopsie xD
HSC 2019

ATAR:
Aim = 92+, Actual = 97.1

#### RuiAce

• ATAR Notes Lecturer
• Honorary Moderator
• Great Wonder of ATAR Notes
• Posts: 8745
• "All models are wrong, but some are useful."
##### Re: HSC Maths Advanced - 25/10/19 - Discussion, Questions & Potential Solutions
« Reply #5 on: October 25, 2019, 08:34:52 pm »
Thanks so much Rui!!!

For 16 b, would the height be pi/4 or pi/2? And hence it would be pi/12(y0 + ylast 4yodd) ? cause I got 1.53 rip pls tell me I didn't make a big oopsie xD
Oh yikes haha definitely $\frac\pi{12}$! Thanks will edit that later

#### RuiAce

• ATAR Notes Lecturer
• Honorary Moderator
• Great Wonder of ATAR Notes
• Posts: 8745
• "All models are wrong, but some are useful."
##### Re: HSC Maths Advanced - 25/10/19 - Discussion, Questions & Potential Solutions
« Reply #6 on: October 25, 2019, 09:57:14 pm »
Apologies for the slowness. This is surprisingly hard juggling two subjects simultaneously!

#### Husky

• Posts: 10
##### Re: HSC Maths Advanced - 25/10/19 - Discussion, Questions & Potential Solutions
« Reply #7 on: October 26, 2019, 12:51:41 am »
Isn’t question 13 part (a) = sinx(cosx-1) as opposed to how you factorised it?
I could be wrong though

#### abdulrahmanb8

• Posts: 15
##### Re: HSC Maths Advanced - 25/10/19 - Discussion, Questions & Potential Solutions
« Reply #8 on: October 26, 2019, 12:55:38 am »
Yeah I saw that! Also for part b) it should be minus 2 × 20 ×20
Isn’t question 13 part (a) = sinx(cosx-1) as opposed to how you factorised it?
I could be wrong though

#### Husky

• Posts: 10
##### Re: HSC Maths Advanced - 25/10/19 - Discussion, Questions & Potential Solutions
« Reply #9 on: October 26, 2019, 06:35:38 am »
Also wouldn’t the final answer to the financial question be 24 not 25? Because the question asks how many times can a FULL withdrawal of $80000 be made. So instead of rounding up the final answer for n, shouldn’t it be rounded down? #### fun_jirachi • MOTM: AUG 18 • HSC Moderator • Forum Leader • Posts: 654 • All doom and Gloom. ##### Re: HSC Maths Advanced - 25/10/19 - Discussion, Questions & Potential Solutions « Reply #10 on: October 26, 2019, 08:04:19 am » Isn’t question 13 part (a) = sinx(cosx-1) as opposed to how you factorised it? I could be wrong though It's fine as written Yeah I saw that! Also for part b) it should be minus 2 × 20 ×20 That's either okay, or since been corrected Also wouldn’t the final answer to the financial question be 24 not 25? Because the question asks how many times can a FULL withdrawal of$80000 be made. So instead of rounding up the final answer for n, shouldn’t it be rounded down?
Yes, you're right here! Definitely should be 24, not 25.

The solutions to the remaining questions are here:
Two notes: a) Click to expand the photo! b) Let me know if there's anything you can't actually read (either my handwriting/photo quality)
Question 11

Question 12

Question 14

Failing everything, but I'm still Flareon up.

HSC 2018: Modern History [88] | 2U Maths [98]
HSC 2019: Physics [92] | Chemistry [93] | English Advanced [87] | Maths Extension 1 [98] | Maths Extension 2 [97]
ATAR: 99.05

UCAT: 3310 - Verbal Reasoning [740] | Decision Making [890] | Quantitative Reasoning [880] | Abstract Reasoning [800]

Subject Acceleration (2018)
UCAT Question Compilation/FAQ (2020)

#### THSCStudyOnly

• Posts: 13
##### Re: HSC Maths Advanced - 25/10/19 - Discussion, Questions & Potential Solutions
« Reply #11 on: October 26, 2019, 09:18:20 am »
Thanks for the solutions!
fun_jirachi I think you may have made an error for Q12 Ciii and Q 12 d

Q12 C iii)
Shouldn't it be 54 days, subbing this into L(t) gives 119 leaves, whereas subbing 55 days gives 91 leaves

EDIT: Is this because there is 100 trees at 54.3 days. Thus it needs to be day 55 for there to be less than 100 leaves. If so I wrote 54 in the exam (I had the decimal places above, do you think I will lose a mark?). Although there aren't 100 leaves for either 54 or 55 so shouldn't it have been left as a decimal?

Q 12d
« Last Edit: October 26, 2019, 09:23:26 am by THSCStudyOnly »

#### THSCStudyOnly

• Posts: 13
##### Re: HSC Maths Advanced - 25/10/19 - Discussion, Questions & Potential Solutions
« Reply #12 on: October 26, 2019, 09:28:20 am »
RuiAce,
I think you have a error for 13b)
The 70pi/9 = 24.4 so the perimeter has to be larger...
I get around 47.37cm

Also what do you think 90-92 raw mark will align to?
« Last Edit: October 26, 2019, 09:30:18 am by THSCStudyOnly »

#### RuiAce

• ATAR Notes Lecturer
• Honorary Moderator
• Great Wonder of ATAR Notes
• Posts: 8745
• "All models are wrong, but some are useful."
##### Re: HSC Maths Advanced - 25/10/19 - Discussion, Questions & Potential Solutions
« Reply #13 on: October 26, 2019, 09:52:49 am »
There were some corrections I implemented later last night but didn't post to confirm that I had. Will address the remainder now.

Q16 - with the finance, totally did't register the wording last night, oops

#### Husky

• Posts: 10
##### Re: HSC Maths Advanced - 25/10/19 - Discussion, Questions & Potential Solutions
« Reply #14 on: October 26, 2019, 10:13:37 am »
So what do you guys think the band 6 cut off will be?