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# Edexcel A2 C4 Mathematics June 2016 - Official Thread watch

1. Fairish paper, pretty gutted about no connected rates of change question those are by far the best part c4

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2. (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
i done 512 but within the last 1 minute of the exam i noticed it was 544 once I worked out the volume using 1/3piRsquaredH

god bless
3. how many marks was question 7
4. (Original post by Yua)
got everything the same
Which question was the implicit differentiation one?

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5. how many marks was question 4?
6. How was it not 1024pi/5
7. (Original post by Azzer11)
Which question was the implicit differentiation one?

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3 I believe
8. Only thing I seem to have got different to everyone is co-ordinates for the last question.

Stored it in my calculator as (-1, 33/5, 16/5) and (3, 17/5, 4/5) so either I stored it wrong or I made a stupid error lol
9. For the volume question, how was it 544pi? It had to be 576pi as u had to work out the whole cylinder and take it away by the integral surely!
10. (Original post by HarshaPeed)
I Got 633 mins.
i got 0.439 days or something but it said to give it to the nearest min not to convert to mins. e.g like 0.5435 km is 0.544 km to the nearest m
did you have to convert to mins?
11. (Original post by Smithy1597)
How was it not 1024pi/5
That's the volume of the portion you take away from the entire cylinder
12. (Original post by BenGeorge)
I found this 10 times easier than C3. Its amazing how much a change in mindset affect your grade.
What was the change in thinking ?
13. So annoyed at myself for messing up the implicit differentiation. Do you think I'll get any marks with like error carried forward or not?
14. I got 3164 minutes for the decay one anyone else?

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15. I got cos(theta)= -1/5. How many marks will I lose for this and i got part E) correct?
16. (Original post by Whizbox)
Only thing I seem to have got different to everyone is co-ordinates for the last question.

Stored it in my calculator as (-1, 33/5, 16/5) and (3, 17/5, 4/5) so either I stored it wrong or I made a stupid error lol
i think this is what i got
17. (Original post by Whizbox)
Only thing I seem to have got different to everyone is co-ordinates for the last question.

Stored it in my calculator as (-1, 33/5, 16/5) and (3, 17/5, 4/5) so either I stored it wrong or I made a stupid error lol
I got that
18. (Original post by riffy123)
For the volume question, how was it 544pi? It had to be 576pi as u had to work out the whole cylinder and take it away by the integral surely!
it wasn't 576pi either. it was 544pi - (1024/5)pi = 1696/5 pi
19. Marks for each Question:
1A) 6
2A) 1 B)3 C) 5
3A) 5 B)4
4A) 4 B)3
5A) 4 B)2
6A) 6 B)5 C)5
7A) 2 B)1 C)4
8A) 1 B)2 C)2 D)3 E)2 F)5
I think please correct me if I'm wrong.
20. (Original post by ryanroks1)
Wasn't it 60e^-2.5t?
I got that.

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