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# Edexcel A2 C4 Mathematics June 2016 - Official Thread watch

1. (Original post by hollycooper_1)
can anyone reemebr the marks allocated and the questions?
i know this much

1 binomial expansion - (5marks)
2
3
4 decay a) solve dx/dt = -5/2x in terms of x and t (4 marks) b) x=60 to 20, find t (for this i got ln(60)=c) and 234 minutes (4makrs)
5
6
7 integrate (2x-1)^3/2 (2 marks) b) coordinate of k (3/4marks) c)volume of S (7marks)
8 vectors a) find a , b) equation of l2, c) d) e)area of triangle
8f) finding the points of E was worth 5 marks
2. Sick exam, curbstomped it
3. ohh wtf that was a cylinder
4. Anyone else get a=4/3 and b=-rt3 the last part of question 6? (i think it was this question)...
5. For Q7 working out the volume, i rearranged it to make x the subject and then i worked out the volume in terms of y although i think i got the answer wrong, would i get marks for this?
6. loool im thick as mince and i got 65 this was defintely easy
7. (Original post by ml1217)
How many marks is the last question (coordinates of E)?
5 i think
8. (Original post by Questioner1234)
60e^-2/5t
Wasnt it 60e^-5/2t
9. That was a beautiful exam fully expecting 90+ UMS

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10. (Original post by Marshmallow21)
How was the area 12/5. I got 4
It wasn't a right-angled triangle.
11. For 8f i got the co orxs but didnt show how i got my lamda values as i ran out of time, how many marks would i lose? It was /5
12. (Original post by tsred)
I got 512pi-(10245)pi as well...
(Original post by NamelessPersona)
Fairly certain this is correct as it simplifies to 1696/5 pi
512-(1024/5) doesn't take in to account the volume between 0 and 1/2

It was 544-(1024/5) or what you said plus 32
13. In the substition I got lambda to be 16. Assuming everything else was right, how many marks?
14. (Original post by Student403)
512-(1024/5) doesn't take in to account the volume between 0 and 1/2

It was 544-(1024/5) or what you said plus 32
Yeah it was 544 pi
15. (Original post by lonelysoul)
For Q7 working out the volume, i rearranged it to make x the subject and then i worked out the volume in terms of y although i think i got the answer wrong, would i get marks for this?
I did the same. Don't know if it's right
16. (Original post by amelienine)
i've made a ton of careless mistakes
same, reading this had made me feel worse needed to get a A but thats not happening...
17. (Original post by cjlh)
My full solutions:

1) 1/8 - 15/16 x + 75/16 x^2 - 625/32 x^3

2) 0.6595, 1.083, 8/3 ln(2) - 7/9

3) (-2-4xy)/(2x^2 + 4 + pisin(0.5pi)), (3pi+62)/(pi+22)

4) x=e^(ln(60)-2.5t)), 633 mins

5) (-5root(3)/16), (4,5root3)

6) 3ln(3y+2)-2ln(y)+c, lambda=8, 4pi/3 - root3

7) k=17/2, 1696pi/5

8) {3,5,0}, r = {1,5,2} + lambda{-5,4,3}, k=2, cos(theta)=4/5, area=12/5, possible positions {3, 33/5, 16/5} and {-1, 17/5, 4/5}
got everything the same
18. I found this 10 times easier than C3. Its amazing how much a change in mindset affect your grade.
19. how many marks was the final part of the volume question plssssss someone tell

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