AQA Core 4 Exam Discussion 14/06/2012 !Poll, paper and unofficial MS (first post)!

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What came first? Finding T or finding N? I can't remember what I got for the first one, but I got 28 for the last part of the question I think. Is that right?

More importantly, what came first, the dinosaur or the egg?

Just kidding..I think T was last

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Reply 801

Quexx

Just realised my mistake finding T.. :-(
To do it using logs you need to put 1500(1.015)^n = 1000(1.03)^n
(1.015)^n/(1.03)^n = 2/3
(1.015/1.03)^n = 2/3
n = log{1.015/1.03}(2/3)
Where 1.015/1.03 is the base
n =27.6
T = 28

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Reply 802

Cath-ay

Hey all,

I've attached today's C4 paper.

Maybe someone can make a detailed unofficial MS?

Edit: reuploaded Q6

Edit 2: marks for Q5 are ai) 4 marks, aii) 2
marks, b) 3 marks
Sorry for any inconvenience caused.

(edited 11 years ago)

Let's just give ourselves a pat on the back for doing a hard exam and don't worry about grades. In the long run they don't really matter...really

Reply 804

JulietheCat

Original post by Dangerous Theory

Yeah trial and error has always been accepted afaik. It was something like Tln1.03 = ln3/2 + Tln1.015, so Tln(1.03/1.015) = ln3/2, divide for T

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Thank you too! I also did trial and error. So that's 4 more marks gained but one mark less (I thought that the range was |x|<4?).

In a worst case scenario 56/75. Hopefully still a B!

(edited 11 years ago)

Reply 805

Raj K

Original post by Cath-ay

Hey all,

I've attached today's C4 paper.

Maybe someone can make a detailed unofficial MS?

thanks for this but like where did you get this from lool :O

Reply 806

Dangerous Theory

Original post by Cath-ay

Hey all,

I've attached today's C4 paper.

Maybe someone can make a detailed unofficial MS?

6th attachment seems partly missing

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Reply 807

Dangerous Theory

Original post by tom24s

Let's just give ourselves a pat on the back for doing a hard exam and don't worry about grades. In the long run they don't really matter...really

For those of us with aspirations, they matter a lot.

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Reply 808

Cath-ay

Original post by Raj K

thanks for this but like where did you get this from lool :O

Made it out of playdough... Lol jk, I asked my amazing maths teacher for it. :smile:

Reply 809

Dangerous Theory

Original post by Cath-ay

Made it out of playdough... Lol jk, I asked my amazing maths teacher for it. :smile:

Hahahahaa!

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Reply 810

LGrosvenor101

Original post by Cath-ay

Hey all,

I've attached today's C4 paper.

Maybe someone can make a detailed unofficial MS?

Thank you so much! If I have counted correctly, I think I've got around 63 raw marks, and I know the grade boundaries change from paper to paper, but can anyone give a rough estimate of what UMS that would be? Sorry for asking and being a pain, but I'm not really that good with guessing the grade boundaries if its a hard/easy paper etc :s-smilie:

thanks

Reply 811

Cath-ay

Original post by Dangerous Theory

6th attachment seems partly missing

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oh damn. should have checked before posting. I'll scan it again.

Reply 812

Wolwen

Original post by Cath-ay

Hey all,

I've attached today's C4 paper.

Maybe someone can make a detailed unofficial MS?

thank you

Reply 813

SomeoneIveNeverMet

Someone earlier said 65/75 June 2011 was 100%UMS...so any chance say, 70/75 for this paper will be 100%UMS?

Reply 814

f1mad

Original post by Quexx

Close to I reckon, but what did you write as your differential equation?
dh/dt=

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dx/dt= k(2-h).

Reply 815

SomeoneIveNeverMet

Original post by LGrosvenor101

thanks

If it's like last June, A* (about 95 maybe), if it's like Jan, A/A* (around 90)..if it's a normal paper, then an A/B

Meh. I fail at guessing too.

Reply 816

JulietheCat

Original post by tom24s

Let's just give ourselves a pat on the back for doing a hard exam and don't worry about grades. In the long run they don't really matter...really

Maths is part of my uni offer. B or higher, they said. I can get the other As in my other subjects but Maths is the sting in the tail.

Reply 817

Anon217

Original post by tom24s

Let's just give ourselves a pat on the back for doing a hard exam and don't worry about grades. In the long run they don't really matter...really

in the short term, for getting into university, they do :s-smilie:

...but you're right tho, it was a hard paper and we deserve some credit :smile:

Reply 818

Oromis263

Question 1.
ai)

Unparseable latex formula:

\dfrac{5x-6}{x(x-3)} = \dfrac{A}{x} + \dfrac{B}{x-3}[br]\[br]5x-6 = A(x-3) + Bx[br]\[br]Let x = 3 \Rightarrow 9 = 3B \Rightarrow B = 3[br]\[br]Let x = 0 \Rightarrow -6 = -3A \Rightarrow A = 2[br]\[br]\dfrac{5x-6}{x(x-3)} = \dfrac{2}{x} + \dfrac{3}{x-3}[br]

aii)

2lnx + 3ln(x-3) + c

bi)

Unparseable latex formula:

4x^3 +5x -2 = (2x+1)(2x^2 +px + q) + r[br]\[br]Using\ factor\ theorem,\ do\ f(\dfrac{-1}{2})[br]\[br]4(\dfrac{-1}{2})^3 + 5\dfrac{-1}{2} -2 = -5,\ therefore\ r = -5[br]\ [br]Now,\ 4x^3 +5x +3 = (2x+1)(2x^2 +px + q),\ so\ by\ inspection\ p = -1 and q = 3

bii)

Unparseable latex formula:

Now\ divide\ the\ function\ previously\ found[br]\[br]\Rightarrow \dfrac{2}{3}x^3 -\dfrac{1}{2}x^2 + 3x -\dfrac{5}{2} ln(2x+1) + c

(edited 11 years ago)

Reply 819

LGrosvenor101