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# Edexcel A2 C4 Mathematics June 2015 - Official Thread watch

1. (Original post by JulianS96)
I got the same thing too.
Something like 12000 -6 = 4000e^1/2sin2t
Then ln2.9985 = 1/2sin2t
Therefor 2ln2.9985 = sin2t
Therefore 2t equals Math Error
You got the ln part wrong.
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3. (Original post by _bindra)
1) 90% Avg in C3 and C4
2) 480 (or more) in all your maths modules combined
Is this the same for if you're doing further pure maths?

So if I got 90% avg in C3 and C4 but totally flopped in FP2, but still managed to get 80% overall over C1 C2 FP1 and FP2 would I still get the A*?
4. (Original post by physicsmaths)
Cheers, 75 in both C3/4. Whooh with bo pst past papers 😂

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please make a mark scheme then
5. Yeshhh i got 4 marks.
6. (Original post by abigail love)
yeah
I'm not sure you should have been having to integrate that in the first place in C4. Was there a previous part to the question?
7. (Original post by abigail love)
yeah
no

3^2x
8. (Original post by Ohwhenwilson)
Ahh damn but ty, for part c) did you get 5/3?
I only realised how to do it within like 30 seconds of the exam ending so I ended up only writing down the method and multiplying out fractions. Didn't have enough time to calculate it but oh well
9. How do you even do question 6 when it was integrate by substitution?
10. (Original post by JaySP)
We said that the radius of the cone was 2 when it was actually 9 😢
radius of cone was 9-that point you 2-1/ln3
11. (Original post by anonwinner)
1. It didn't say what number the population started at, it could have started at 3999

2. With questions like these you always use radians...
it said when t=0, P=3 ...
12. (Original post by GTA5)
I doubt it. 0.2 yrs for the animals to reach a population of "4000"?! It has to be in degrees so u get 27yrs. C'mon lets be realistic. Do u think humans can produce 4000 offspring in 73 days? (0.2 yrs)
but if you put 0.473 back into the original equation, you get a population 4000 so it's not 27 years sorry to disappoint :l
13. anyone get 53pi/ ln3 for the last question?
14. (Original post by PaulCJH)
My answers, judging by other people's opinions I think they're right:
Attachment 429779
Agree. Can't remember what I put for 8b) but I think it was that ^
15. (Original post by Seventeen)
Paper was Alright not sure its good enough though to compensate for C3 and bring it up to an A*.
Thank you God for the easy vector questions.
I noticed P was in thousands in the last minute of the paper. I got a dodgy answer for the final question. When you guys calculate the Volume of the cone 1/3 (pi) r2h is h=9 and r= ln3?
That's what I got
16. (Original post by Seventeen)
Paper was Alright not sure its good enough though to compensate for C3 and bring it up to an A*.
Thank you God for the easy vector questions.
I noticed P was in thousands in the last minute of the paper. I got a dodgy answer for the final question. When you guys calculate the Volume of the cone 1/3 (pi) r2h is h=9 and r= ln3?
Same... C3 was a bit off this year, I was so happy when I got to the easy vector question so early in the paper.
When I finished I was like "this was too easy" so I flicked through the paper and made sure I had answered all the questions.
17. Hopefully Bristol let me in with AABa, rather unlikely though
18. VOTE NOW ON HOW YOU FOUND THIS EXAM
Note: C4 JUNE 2015 UK paper ONLY!
19. (Original post by joe1545)
Should of got 32x which can be integrated pretty easily using substation
Or simply let 3^(2x) = (3^(2)^x) = 9^(x);

This then gives (1/ln(9) * 9^(x)) + C
20. What are your predictions on A* and A guys?

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