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# OCR (not MEI) C1 - Wednesday 13th May 2015 watch

1. (Original post by Parallex)
FP1 tomorrow
Good luck!

I thought it was an OK paper, maybe slightly harder than last year. Made a few really really stupid mistakes though...kicking myself!

From the OP:
June 2013: A - 60, B - 54, C - 48, D - 43, E - 38.
June 2014: A - 65, B - 59, C - 53, D - 47, E - 41.

So maybe A = 63 this year?
2. (Original post by Numpers123)
A 62
b 56
my guess, so 90 ums I guess is 67
and 100 ums 72
And 100 UMS will undoubtedly be 71 or 72 again
3. if i got the radius as 5 but have wrong/no working would i get any marks
4. yeah probably 61-63 for an A
5. I didn't realise the one with the stationary points only asked for the x coord. I went on to find the y one too which was some fun arithmetic with fractions, haven't done that since year 7, clearly too reliant on fractions. Spent most of the exam worrying that my answer of 89/27 was wrong because it's too random. Oh well, would have been sat there for an hour doing nothing if I hadn't have bothered
I don't think it was much different from last years paper so I'd expect the boundaries to be similar.
6. can anyone remember the find a question

just wanted to check something
7. (Original post by scrlk)
Good luck!

I thought it was an OK paper, maybe slightly harder than last year. Made a few really really stupid mistakes though...kicking myself!

From the OP:
June 2013: A - 60, B - 54, C - 48, D - 43, E - 38.
June 2014: A - 65, B - 59, C - 53, D - 47, E - 41.

So maybe A = 63 this year?
(Original post by Parallex)
yeah probably 61-63 for an A
hope these are right ^^ guesing ive lost about 6 marks total from what other people have got, so need a secure boundary like that for an A

C2 next week, hope its as nice as c1 :P
8. (Original post by Parallex)
can anyone remember the find a question

just wanted to check something
what question?
9. (Original post by ella_chloe)
what question?
find a given that x=4 was a stationary point or something

like can anyone remember f(x)
10. (Original post by Numpers123)
I got 25 for last one so annoyed. And had the right answer for k then crossed it out
I got 25 as well
11. How many marks was the first question?
12. (Original post by jt663)
I got 25 as well

W should get 3 of the 4 marks though
13. (Original post by chloe-jessica)
Can't remember the question order so sorry if it's wrong (it's definitely wrong). From what I can remember:
1) 4 + 4root3
2) can't really describe the graph, if you know what y=1/x looks like then reflect in either axis.
Translation of 2 in x was -1/(x-2)
The translation they wanted you to state was a stretch of 1/3 in either axis.
3) 5^8
5^(-1/4)
5^(9/2)
Factorise the quadratic, draw graph. For y>0, x<-1 or x>3/2
K < -25/8
5) differentiation? Can't remember the answer to this, was reasonably straight forward though if you expanded brackets.
6) simultaneous equation - x=1, y=2 or x=14/3, y=-13/3? Not sure about signs
7) differentiate x^(-1/3)? Should get out -1/48 when you put x in.
8) coordinate geometry? Line was something like 6x-8y-29=0
9) a=13
Second derivative was positive therefore min points
X=1/3
Prove tangent
Area of triangle = 40
I've just realised how much I really cannot remember the order. These are my answers which seem to be generally accepted within my school and by various people on here. They may not be right.
what was the question involving k?
14. (Original post by Parallex)
find a given that x=4 was a stationary point or something

like can anyone remember f(x)
point b had x=4, and f(x) uhm i cant remember dy by dx was like 18x something if that rings any bells sorry aha
15. (Original post by Parallex)
find a given that x=4 was a stationary point or something

like can anyone remember f(x)
2x^3-2ax+???
16. Can someone explain the last question I got 50 and I really don't get how it's 40? Where does the circle and tangent meet the y axis ???
17. (Original post by Parallex)
find a given that x=4 was a stationary point or something

like can anyone remember f(x)
I think the gradient function was 6x2 + 2ax + 8
18. (Original post by Maprunner)
I think the gradient function was 6x2 + 6x + 8
that was dy by dx i think? and it had -2a and a was 13 or something idk
it was a cubic i thought?
19. (Original post by Patsella)
Can someone explain the last question I got 50 and I really don't get how it's 40? Where does the circle and tangent meet the y axis ???
Sub in x=0 in to both equations.

You get (0, -2) & (0, 8)

(b*h)/2 -> (10*8)/2 = 40

Got this wrong as well.
20. (Original post by Patsella)
Can someone explain the last question I got 50 and I really don't get how it's 40? Where does the circle and tangent meet the y axis ???
someone posted a graph with the diagram and how they got the answer a couple of pages back x

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