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# OCR C4 (not mei) 18th June 2013 revision Watch

1. (Original post by strikerextreme)
Attachment 227973

for this question i solved the diff equation but my answer wasnt expressed as r=

how many marks would i lose ?
i got the c value
i done the same...i left it as 2/3 r something.... and not simplify it. i got c as 9/5.
2. (Original post by strikerextreme)
Attachment 227973

for this question i solved the diff equation but my answer wasnt expressed as r=

how many marks would i lose ?
i got the c value
1 mark.
3. Does any one remember how many marks q9 was???
4. (Original post by ActaNonVerba)
Didn't it say acute angle, which would be 180-your answer? I put both down just in case
I don't think it specified acute.

(Original post by strikerextreme)
Attachment 227973

for this question i solved the diff equation but my answer wasnt expressed as r=

how many marks would i lose ?
i got the c value
You'd probably only lose 1 for not being in the correct form.
5. Just That is all.
6. (Original post by Kayoz)
Does any one remember how many marks q9 was???
3+4+2 = 9 marks in total
7. (Original post by SJ12345)
Did anyone get 0.136 on any part of question 10?
I got that for the decimal estimate for the value of 100/729, 10ii.
8. Right so for 7. (ii). I had the 2 vectors r=(-1, -3, -9) and s=(1, 1, 5) but I went in to auto pilot and did r x s, got -1*AD, will I get marks for using alternate method?
9. (Original post by kark94)
3+4+2 = 9 marks in total
thx!
i prob lost 4 marks for stupidly re-arranging to get t=-1
10. What do people think the volume of the pyramid was?

I'm hoping for 64 for A* :L
12. (Original post by XingBairong)

I'm hoping for 64 for A* :L
Im thinking they will be semi low, compared to other papers I thought it was quite hard, 64 will easily be A* I reckon.
13. for the parametric question i gt dy/dx = 2-2/t

i then did dy/dx = 0, and got t=1.

i then subbed it back into the parametric equations to get stationary points.

i then found dy/dx for t=2 and t=-1.

i the said point was a max point...

do you fink thats rigght, any one else do that?????
14. (Original post by junaid_k17)
for the parametric question i gt dy/dx = 2-2/t

i then did dy/dx = 0, and got t=1.

i then subbed it back into the parametric equations to get stationary points.

i then found dy/dx for t=2 and t=-1.

i the said point was a max point...

do you fink thats rigght, any one else do that?????
t is 1 and it is the minimum point as the second derivative > 0.
15. also what do u fink a C grade will be, cuss i fink i gt 43/72????????????
16. What's the theory for q10 to get 1/10.. I made a random guess and it worked, but can someone explain how you would get 1/10.. And explain 10i) I couldn't do that
17. (Original post by ActaNonVerba)
What's the theory for q10 to get 1/10.. I made a random guess and it worked, but can someone explain how you would get 1/10.. And explain 10i) I couldn't do that
10i) was just expansion so you had x(1-x)^-3 and u expand the brackets first and multiply ur answer by x and you got the answer they asked for!
18. I made a really weird way of estimating 100/729, I multiplied by the denominator and just let x = 100/729. This is completely valid, but will this get me the marks?
19. (Original post by JimmyA*)
The student room finding it ok is different to how the rest of the population found it
Yeah i guess! Just hoping there's plenty of marks for working out haha
20. biggest, fail of my life. fingers crossed that the grade boundary for an a is about 30 percent, then i might have a chance of an a !

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