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# AQA A2 Mathematics MPC4 Core 4 - 9th June 2015 [Discussion & unofficial markscheme] watch

1. Either 6 or 7 marks I think. 7 sounds about right. I think you would only lose a couple marks.

(Original post by vicki36)
Does anyone know how many marks question 8a was out of? I didn't realise you had to find the constant once you integrated so I just rearranged it to x=f(t) but left C in. How many marks do you reckon I'd lose if I did everything else correct? Thanks
2. (Original post by laurenn1995)
on the trig question r(cosx-angle) did anyone get r=root29 and angle +1.19??? Anyone?? Think that's what I put... And then x at max value 5.09 or something?
I got that☺️

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3. All My answers, really not sure on the coordinates for E though.
4. Am I the only one who put the x coordinate for Q in terms of cos? I got as my value of p was
5. (Original post by vicki36)
Does anyone know how many marks question 8a was out of? I didn't realise you had to find the constant once you integrated so I just rearranged it to x=f(t) but left C in. How many marks do you reckon I'd lose if I did everything else correct? Thanks
99.9% sure it was 7marks
6. (Original post by Alicebrooke)
I got that☺️

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I got -1.19 ahhh
7. (Original post by Eliott2406)
For the differential equation what values did you have to substitute for x and t?
They worded it sneakily and said that "initially the pond is empty", or something to that effect. Therefore, the values you subbed in were t = 0, x = 0.
8. Is there an unofficial mark scheme? That went so badly for me there's no point me making one.

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9. How many marks do you think 90 ums will be?

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10. i'm sure it was -1.19 because max value when cos(x+1.19)=1, this happens when cos(0) so x+1.19=0 so x=-1.19
11. (Original post by CD223)
Is there an unofficial mark scheme? That went so badly for me there's no point me making one.

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I put my answers up, Dif equation is wrong and not unsure on coordinates of e
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12. (Original post by RastaMouse96)
I got -1.19 ahhh
Yes that's what x came to but they wanted the maximum value, and as you know there were two values in the range (1.19 and 2pi - 1.19) you got 5.09 .
13. I got 5.11 for the max value
14. (Original post by Eliott2406)
For the differential equation what values did you have to substitute for x and t?
I put in 0 for both
15. (Original post by RavinderKlair97)
i'm sure it was -1.19 because max value when cos(x+1.19)=1, this happens when cos(0) so x+1.19=0 so x=-1.19
yes or when it is 2pi.
They specified x >0 and <2pi.
therefor x max was 2pi-1.19 to 3.s.f :P
16. (Original post by CD223)
Is there an unofficial mark scheme? That went so badly for me there's no point me making one.

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Oh no !
17. I'm gutted. A* gone.

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18. I got E(23,4,0) and E(11,11,0)
19. (Original post by datpr0)
They worded it sneakily and said that "initially the pond is empty", or something to that effect. Therefore, the values you subbed in were t = 0, x = 0.
Fml i thought of putting these and I didn't... How many marks will I lose if I didn't find C?
20. Anyone know the actual question for 8a

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