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# Mr M's OCR (not OCR MEI) Core 2 Answers May 2013 Watch

1. (Original post by SBH2H)
For question 7(ii), I found the equation of the tangent and integrated to find the area beneath it (between 4 and 5/3). I got the correct answer, so will this be alright?
Yes of course.
2. This paper was a lot nicer than Jan

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3. Didn't think the exam was too bad actually compared to some previous papers. Guessing the boundaries will be high though!

Hope everyone did well and thanks to Mr M for always being reliable with mark schemes after exams
4. (Original post by Goods)
Would there be any problem in quoting the angles in the first question to 1dp?
Second question? No.
5. (Original post by AlmightyPhil)
Mr M,

Also for question 9(ii) I did the algebraic division with 2x+1 and got 0 as an end result and then commented that the 0 remainder meant that (2x+1) is a factor of f(x). Would this still be proof of (2x+1) being a factor?
Yes
What would you guess is the 100 UMS boundary for this year? Maybe 70/72?
I don't guess.
7. (Original post by Becky.96)
I think the grade boundaries on this exam will be quite low due to it being a hard exam and core 1 on monday being so easy
The difficulty of a Core 1 paper cannot affect Core 2 grade boundaries.
8. (Original post by breakeven)
Didn't think the exam was too bad actually compared to some previous papers. Guessing the boundaries will be high though!

Hope everyone did well and thanks to Mr M for always being reliable with mark schemes after exams
You are welcome.
9. 67/72 how many ums will this be roughly?

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10. for 9.iii) i done everything right but left my answer in degrees cos they had no decimal places. how many marks do you think i'd lose? thanks
11. For the perimeter question 5(ii) I calculated the length BD using the formula 2rsin(θ/2) which gave me 12.461....
I then added this to 12.8 and 9 to give an answer of 34.3cm (3sf).
How many marks would I lose for this and why isn't this correct?
12. (Original post by odbal)
for 9.iii) i done everything right but left my answer in degrees cos they had no decimal places. how many marks do you think i'd lose? thanks
You need to read the question more carefully. Lose 1 mark.
13. Mr M,

two qquestions for the N=17 question, I got N=17.2 how many marks would I lose?

Also the final question, I got the three values but I wrote (pie) twice, would I lose any marks?

thanks
14. (Original post by germankid101)
For the perimeter question 5(ii) I calculated the length BD using the formula 2rsin(θ/2) which gave me 12.461....
I then added this to 12.8 and 9 to give an answer of 34.3cm (3sf).
How many marks would I lose for this and why isn't this correct?
I have no idea where that formula appeared from! Drop 2 marks.
15. (Original post by Bilal.Patel)
Mr M,

two qquestions for the N=17 question, I got N=17.2 how many marks would I lose?

Also the final question, I got the three values but I wrote (pie) twice, would I lose any marks?

thanks
drop 1 mark and get full marks
16. Can you leave the answer for the trapezium question as a fraction and gain full marks?

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17. (Original post by Namige)
Can you leave the answer for the trapezium question as a fraction and gain full marks?

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Of course.
18. Roughly for an A????????

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19. (Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 2 Answers May 2013

1. 6.39 (4 marks)

2. (i) 254 and 106 degrees (3 marks)

(ii) 71.6 and 252 degrees (3 marks)

3. (i) (4 marks)

(ii) c = - 11 (3 marks)

4. (a) (3 marks)

(b) (i) (2 marks)

(ii) a = 2 (3 marks)

5. (i) 62.2 (4 marks)

(ii) 34.0 (4 marks)

6. (i) 963 (3 marks)

(ii) 17 (6 marks)

7. (i) Show ... (4 marks)

(ii) (5 marks)

8. (i) (a) (0, 1) (1 mark)

b) (0, 4) (1 mark)

c) Any value where a > 1 and any value where 0 < b < 1 (2 marks)

(ii) Show ... (5 marks)

9. (i) 15 (2 marks)

(ii) Show f(-0.5)=0 and (6 marks)

(iii) and and (4 marks)

I'll be around a bit this afternoon and then part of this evening to answer questions. Please post in this thread rather than sending me private messages.
Shouldn't 9(iii) be 5pie/3 not 4pie/3?
Also how did you get the answer to 7(ii). I got 1.9
20. (Original post by Music99)
For the area under the curve how many would I drop for, writing down it was the integral- the area of the triangle. I messed up calculating the x coordinate so in the end just guessed it as 2, in a last ditch effort :P

also for question 8 didn't b have to be a negative number?
I put b as -2 at it was y=4b^x and it crossed the y-axis at (0,4) which is only possible is b is negative.

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