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# OCR (not MEI) C2 - Wednesday 20th May 2015 watch

1. (Original post by DominoMatrix227)
Was there anyone who did not complete all the questions?
Me. I think I got 1-8 all right though so I'll survive
2. (Original post by xsanda)
Xsanda's solutions:
R=-2
ar¹⁰ = 3072
Sum to 20 = -1048575

trapezium: 21.4
narrower strips

triangle area: 32.1
perimeter: 22.7

expansion: 64+192ax+240a²x²+…
a=2/3

y=4x^(3/2)-7x-3
(x-2)(x+5)(x-3)
256
negative section of integration counts negatively

u₂₀ = 62
Σ = 517 (show that)

N=24
n=17.1
x=32, y=8

6π-α
3π-a
graph of sin, half height
3.32, 12.7
Xsanda >>> Alfred W.
3. Why did the alpha thing have to be in radians?
4. (Original post by smoothER)
Why did the alpha thing have to be in radians?
5. (Original post by frinldy dinosawr)
UNOFFICIAL MARK SCHEME

Q1) Fairly basic arithmetic sequences
i) -2
ii) 3072
iii)-1048575

Q2) Trapezium rule 21.4 units^2

Q3) i) Area of shaded region 32.1cm^2
ii) Perimeter of segment 22.7cm

Q4) i)64+192ax+240a^2x^2
ii)2/3

Q5) i)4x^3/2-7x-3

Q6) i) 62
ii) Its a show that question: split up the sum of into two parts and verify

Q7) i) N=24
ii) n=17.1
iii) y=8 x=32

Q8) i)(x-2)(x-3)(x+5) ii) 256 units^2 iv) Reasoning + Graph Q9) i) 6pi - a ii) 3pi-a
iii) Graph
iv) 3.32 and 12.7 and -0.44 and +0.44 or something like that, feel free to correct
All good apart the last one, there's no -0.44 and +0.44, it only intersects the line twice in that entire section.

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6. N was equal to 24, stupidly I had the right workings and added one number wrong so I'll lose 1 mark ffs
7. (Original post by MartoEnchev)
I got a quadratic and the 2 solutions were n=-44 and n=(a positive number not sure the exact value). n can't be negative though. However I don't think that was the right way to solve it
obviously not as its rong but will we get any marks
8. (Original post by AlistairMcDonald)
How come? I thought it just said 2/3cos1/3x or something. Am I supposed to know from that?

Do you think any method marks if in degrees?
9. Can someone please write out a full solution to the aritmethic 2N and N 6 marker, as I have now uploaded the paper. Thanks
10. (Original post by frinldy dinosawr)
UNOFFICIAL MARK SCHEME

Q1) Fairly basic arithmetic sequences
i) -2
ii) 3072
iii)-1048575

Q2) Trapezium rule 21.4 units^2

Q3) i) Area of shaded region 32.1cm^2
ii) Perimeter of segment 22.7cm

Q4) i)64+192ax+240a^2x^2
ii)2/3

Q5) i)4x^3/2-7x-3

Q6) i) 62
ii) Its a show that question: split up the sum of into two parts and verify

Q7) i) N=24
ii) n=17.1
iii) y=8 x=32

Q8) i)(x-2)(x-3)(x+5) ii) 256 units^2 iv) Reasoning + Graph Q9) i) 6pi - a ii) 3pi-a
iii) Graph
iv) 3.32 and 12.7 and -0.44 and +0.44 or something like that, feel free to correct
Sorry what was question 7ii?

Edit - sorry, I mean wasnt it a show that question so whats the 17.2 for?
11. For the integration question about area, were you supposed to answer 256 or give the negative answer? (can't remember if it was -206.5 or -207.5). Because the next question asked why this was not the area for -5<x<3 and this would be 256.
12. Posted from TSR Mobile

Last question Y coordinates 0.894 and - 0.894
13. (Original post by chris2015)
A=53, B= 46. This was the trickiest paper I have ever came across.harder than any previous years.
Reckon it's still easier than last years though :/ what was last year's boundary?

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14. (Original post by frinldy dinosawr)
UNOFFICIAL MARK SCHEME

iii)-1048575 a=3 r=-2
a=3 r=-2
s= 3(1-(-2^10))/1--2 = 1025?
15. (Original post by AlistairMcDonald)
Just a heads up, not sure that you're allowed to post that here!!
Yeah I wasnt sure, removed it now anyway. Thank you for warning me
16. (Original post by chris2015)
A=53, B= 46. This was the trickiest paper I have ever came across.harder than any previous years.
This would be lovely boundaries

Posted from TSR Mobile
17. (Original post by frinldy dinosawr)
UNOFFICIAL MARK SCHEME

Q1) Fairly basic arithmetic sequences
i) -2
ii) 3072
iii)-1048575

Q2) Trapezium rule 21.4 units^2

Q3) i) Area of shaded region 32.1cm^2
ii) Perimeter of segment 22.7cm

Q4) i)64+192ax+240a^2x^2
ii)2/3

Q5) i)4x^3/2-7x-3

Q6) i) 62
ii) Its a show that question: split up the sum of into two parts and verify

Q7) i) N=24
ii) n=17.1
iii) y=8 x=32

Q8) i)(x-2)(x-3)(x+5) ii) 256 units^2 iv) Reasoning + Graph Q9) i) 6pi - a ii) 3pi-a
iii) Graph
iv) 3.32 and 12.7 and -0.44 and +0.44 or something like that, feel free to correct
can u update it and say how many marks each q was please
18. We summon you, Mr M! Please bless us with your mark scheme with mark-breakdown for each question, oh lord!
19. How many marks would you get for the sum2N - sumN question for obtaining an incorrect quadratic and attempting to complete the square?
20. for the simultaneous log one i got x=0.5 and y=512 would i get any marks as when you substitute it into log2x + log2y=8 you get 8?

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