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OCR C3 (not MEI) Official Thread - Tuesday 21st June 2016

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is the new equation x(-2x+5) and -cos*-1(-x)?
Original post by shhenry96
did we forgot to times it by 4?lol


I reckon something to do with cubed bit, and a 2, cos 2 cubed = 8 so if we had an 8 instead of a 2 it would have been 4x8 instead of 4x2
Reply 182
Avatar for klipsy
klipsy
1
Original post by AlfieH
4 - you had to write the equations of the curves after reflections in both axes.

What were those answers???


Fixed now
Original post by daniellon
is the new equation x(-2x+5) and -cos*-1(-x)?


I got y=-x(5-2x)
Original post by daniellon
is the new equation x(-2x+5) and -cos*-1(-x)?


yes
(edited 7 years ago)
Original post by connorbarr
I got y=-x(5-2x)


No sorry i got y=x(5-2x)
Original post by connorbarr
No sorry i got y=x(5-2x)


So yes loool
Original post by connorbarr
I got y=-x(5-2x)


One reflection is on the x axis and another one is on the y axis
Reply 188
Avatar for NotAQA
NotAQA
1
Unofficial markscheme anybody?
Original post by Mathematicus65
All seem perfect - how many marks was 7b)


I think I had the same values for a and b but the other way round
Original post by rich1334
My solutions, in order:Y=12x+15
4x-4lnx-1/x+c
3/16(4x+1)^4/3 + c
128, 81.92
31 hours
1/13, 3/4
Show ln2
5/2
A=6, B=5
Graph
Root 0.242
Graph transformations
Ranges: all real, greater or equal to 4a, modulus has no inverse
Inverse: 1/5(x+4a)
X=1.5a, x=-2.5a
Show equiv to 2
4+2root2
0.659
32sin(x)
No guarantee these are right but I'm pretty confident


I got all but 81.92 part.

I got 65.5.. and thus 66.
for the question where you find area under curve of e lines I got like 24-3/2 as for logs you put the number in front of the logs as the power ?????
Reply 192
Avatar for GM16
GM16
1
Original post by Ligand
People are saying they got pi/6 for 9ii but I got 0.6.. something. Anyone else?

I'm pretty sure I did too



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Unofficial mark scheme HERE: https://docs.google.com/document/d/1UH7gSAq-qwB6b09jmJIYIXNAGZD_vg-RYxBE3Ik_8wE/edit?usp=sharing
For the one about modulus, I only got 1 answer as x = 1.5a because when you draw the graphs they only intersect once - did anyone else get that?
What grade do you reckon 62 marks will be?
Original post by M12345689
What grade do you reckon 62 marks will be?


Low 90s??
Original post by TheNicholas
Low 90s??


Thanks do you reckon it will scrape an A* haha
Grade boundaries anyone?
Going to guess:
41 - C
47 - B
53 - A
59 - A*
Really difficult paper imo.
Original post by HecTic_H
Grade boundaries anyone?
Going to guess:
41 - C
47 - B
53 - A
59 - A*
Really difficult paper imo.


I don't think they'll be that low, a little bit higher maybe 55-A?

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