Arsey's S15 C2 Model Answers

I really didn't think it was too bad

Expect standard boundaries

My GUESS at boundaries would be those very similar to June-13

Session 100' 90' 80' 70' 60' 50' 40'
Jun-14 74 67 60 53 46 40 34
Jun-13 75 69 62 55 48 41 35
Jan-13 75 70 64 57 50 44 38
Jun-12 75 69 63 55 47 39 32
Jan-12 75 68 61 54 48 42 36
Jun-11 75 69 62 54 46 38 30
Jan-11 75 70 65 57 50 43 36
Jun-10 75 69 62 54 46 38 30
Jan-10 68 61 54 47 40 33 27
Jun-09 69 61 53 45 38 31 24
Jan-09 75 66 57 48 39 30 22
Jun-08 75 69 63 54 45 36 27
Jan-08 75 69 62 53 45 37 29
Jun-07 75 67 59 50 42 34 26
Jan-07 75 69 62 53 44 35 27
Jun-06 75 71 67 59 51 43 36
Jan-06 75 70 64 56 48 40 33
Jun-05 75 68 60 52 44 36 28
Jan-05 75 69 62 54 46 38 31

Paper Analysis

Q1. simple binomial expansion, much harder ones have been asked

Q2. very easy circle question, this is normally much harder

Q3 standard algebra question, the only thing unusual was the factor of 3

Q4 standard radians question, you didn't even need to use advanced trig

Q5 a) is a bit odd, I can see that causing problems b) is fine, common question

Q6 very easy, far harder questions have been asked

Q7 not too bad for a logs question

Q8 this will score the lowest marks; however,

a) not too bad, similar has been asked before

b)i) this will cause a LOT of problems but the first mark (of 3) should be a banker, if you didn't know to substitute in 1 - cos^2 you shouldn't have been in the exam

b)ii) even if you couldn't do b)i) this is quite simple if you just sub in k=3 into the equation and treat as normal

Q9 other than the odd, cost part, this was a very standard question

I would say there was only about 6 marks that I would consider harder than normal.

There is no way it will be sub 60 for an A (famous last words)

(edited 8 years ago)

S15 C2 Paper Model red.pdf732.9KB

Scroll to see replies

Reply 1

Kojira

Spoiler

(edited 8 years ago)

Reply 2

Naga7o

How many marks would you get if you used a = 48 by accident but still got the correct number of terms(if a was 48)

cheer arsey

And to think people were berating you for taking more than twenty minutes :tongue:

Cheers!

Posted from TSR Mobile

Reply 5

Dylann

Didn't do the paper this year, but people really should have been prepared given the commotion caused after last year's paper. It's not hard to find challenging maths resources online!

Reply 6

xxxhabashibaxxx

hi on question 8 instead of using the formula cnant you factorise ro (4cosx+3)(cosx-1)

Reply 7

Krollo

Original post by xxxhabashibaxxx

hi on question 8 instead of using the formula cnant you factorise ro (4cosx+3)(cosx-1)

Yeah, that'll be fine too.

Posted from TSR Mobile

Reply 8

AKC...

I thought it to be an average paper, thanks as always Arsey

72/75 here, didn't do my integration in two parts as I didn't think it made a difference, realised it's the modulus...

(edited 8 years ago)

Reply 9

AG98

I'm unable to open it :/

Anyone else getting the same problem?

Reply 10

usmanzubair

68 :O

Posted from TSR Mobile

Reply 11

anndz3007

for the sinx - root3 cosx=0 i did exactly like you, but someone did it by putting sinx=cosxtanx
Therefore cosx(tanx-root3)=0, and that would give you a few more solution...
Other than that, all right

Thanks

Pretty confident on 75 unless you had to explicitly compute for the final part of 9!
I said the second derivative = 12pi + 600/r^3 and as r > 0 this was clearly > 0 therefore it was a minimum! They will accept that right?

Reply 14

ridirahman

How much will a B be?

Reply 15

the north

question 7 y=1/3 cuz its says y<2/11 or something like that?

Reply 16

chezzaspartan

Hi Arsey, thank you so much for posting answers.

With regards to question 8.i), as we are left with tan inverse root 3.....wouldn't the root 3 have both positive and negative values.

For example root 4 = positive and negative 2.

Therefore wouldnt you be required to take into account the values for which it is negative?