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# Edexcel A2 C4 Mathematics June 2015 - Official Thread Watch

1. (Original post by stresso)
Thanks You must have found this second nature to do lol
C4 was considerably easier than C3, imho.
2. (Original post by mc1996)
Yes someone has just pointed that out. It should be -8y
Ya then I got full marks hopefully (somehow)
3. (Original post by tilly_a)
you guys think UMS boundaries will be the same as June 13R paper? so :

A* A B C D E
65 59 47 41 37 27
A* will be higher I think 67-68
4. C4 Edexcel Maths Paper with SOLUTION - 16 June 2015.pdf
C4 Edexcel Maths Paper with SOLUTION - 16 June 2015.pdf
C4 Edexcel Maths Paper with SOLUTION - 16 June 2015.pdf

http://www93.zippyshare.com/d/sxvc4j...une%202015.pdf

http://www93.zippyshare.com/v/sxvc4j9n/file.html
5. (Original post by C++)
I'm sorry, but the mathematics are incorrect;

This means that:

yes i know the maths is wrong, thats why im asking how many marks i could get for method
6. (Original post by Joseph.S)
You seemed to use radians when you found the years. I got that but realized it wanted degrees?
27.1 years.
Oh crap! I was paranoid of making silly mistakes the whole way through the exam and I miss that because my paranoia left me with less time on the last bit! irony's a b**** eh.

I used radians I believe as that's what they usually want and didn't spot is specifying anywhere?? Ended up with like 0.4.... years. Thought nothing of it :L
7. (Original post by tilly_a)
you guys think UMS boundaries will be the same as June 13R paper? so :

A* A B C D E
65 59 47 41 37 27
I doubt it, probably average-high grade boundaries

A* 69
A 63
B 56
C 49
...
8. (Original post by sat_freak)
C4 Edexcel Maths Paper with SOLUTION - 16 June 2015.pdf
C4 Edexcel Maths Paper with SOLUTION - 16 June 2015.pdf
C4 Edexcel Maths Paper with SOLUTION - 16 June 2015.pdf

http://www93.zippyshare.com/d/sxvc4j...une%202015.pdf
Dude you should have made a thread rather than making a post. It would have pissed Arsey right off
9. Help!!

How many marks would I lose for putting 32In2^2 + 32In2 -12 instead of 32In2^2 - 32In 2 +12
10. (Original post by thatNoseyParker)
Oh crap! I was paranoid of making silly mistakes the whole way through the exam and I miss that because my paranoia left me with less time on the last bit! irony's a b**** eh.

I used radians I believe as that's what they usually want and didn't spot is specifying anywhere?? Ended up with like 0.4.... years. Thought nothing of it :L

It would be radians because you used calculus to get it - degrees and calculus don't mix;

http://math.stackexchange.com/questi...ns-in-calculus
11. If I went straight from having - ln3 on one side then combining it to the Ln on the other side in the next step would I lose a mark?
12. (Original post by sat_freak)
C4 was considerably easier than C3, imho.
I would argue the complete opposite, or perhaps it was just the integral in the last question that makes me feel that way :/ But too late now.. thanks for the link, I bet Arsey is using it right now
13. (Original post by Wahid1)
I have a few questions:

1) how many marks do I lose if I found K as 2 and continued so I got the area as half? Out of the total 8 marks of the question.

2) For the differential equation I found c correctly but at the end I couldn't get the final answer they wanted even doe part A was right. How many marks would I lose out of the 7?

3) for the years question how many marks do I lose if I did the question in degrees?

4) for the vector question how many marks do I get (if any) if I found the position vector of B for the shortest distance?

5) for the cone question, do you get one mark for writing V=pi integral of y2? Also due to a lack of time I went to write what I would do instead of doing it, but I wrote the radius will be 9 for the cone et and you do integral until 2 minus the volume of cone from Q to P?

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14. (Original post by Khanlar22)
Do you know if there is error carried forwards in C4 ???
In the mark schemes for past papers I haven't seen it anywhere
15. Hi people could someone answer this since I need an a* in maths for uni..... Basically up to the last question I dropped 4 marks then on 8b I differentiated 3^2x and stuck in the correct limits and did the rest correct but I'm thinking this is a big maths error, how many marks will I loose , the qu was out of 6. Thanks
16. (Original post by mc1996)
These are all my solutions. sorry for the poor quality but should be still readable, should be -8ydy/dx for first line of Question 2
Forgive me is I'm wrong but on question 2, doesn't -4y^2 differentiate into -8y dy/dx not +8y dy/dx??
17. Is Arsey dead or something???

Or maybe he is also mind****ed by that last question xD
18. (Original post by thatNoseyParker)
Oh crap! I was paranoid of making silly mistakes the whole way through the exam and I miss that because my paranoia left me with less time on the last bit! irony's a b**** eh.

I used radians I believe as that's what they usually want and didn't spot is specifying anywhere?? Ended up with like 0.4.... years. Thought nothing of it :L
it doesn't say anything about using degrees?
19. (Original post by sat_freak)
C4 Edexcel Maths Paper with SOLUTION - 16 June 2015.pdf
C4 Edexcel Maths Paper with SOLUTION - 16 June 2015.pdf
C4 Edexcel Maths Paper with SOLUTION - 16 June 2015.pdf

http://www93.zippyshare.com/d/sxvc4j...une%202015.pdf

http://www93.zippyshare.com/v/sxvc4j9n/file.html
guys is this spam or an actual thing?
20. Guys is 480 UMS overall for an A for an A*? In the june 14 grade boundaries it says 480 below A and then nothing for A*?

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