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# Edexcel A2 C4 Mathematics June 2016 - Official Thread watch

1. (Original post by jasonmaths)
For the 'cylinder question' i didnt minus the area - i just did the integration. How many marks is the question and how many marks have i lost? I think i got full marks on all the other questions - is this still an A*?
im the same boat that question ****ed me over, but that part was only 4 marks so youve lost 4 marks maximum and maybe got 1
2. Would 71 on C3 and 68 on C4 be A* overall do people think?
3. (Original post by hann4h)
I think I did partial fractions
Oh man so i didnt get it right then😞
4. (Original post by riffy123)
I did that too and it must be right!
I see the problem now, h is only 17/2 don't need to add a half.
5. That paper was so easy I think I got full UMS for this C4, every single question was easy to verify. Grade boundary predictions anyone? And is someone going to make a poll?
6. How many UMS do you think 66/75 will be?
7. (Original post by ryanroks1)
Would 71 on C3 and 68 on C4 be A* overall do people think?
yes
8. (Original post by Tobi100)
What was lambda?

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2/5
9. Would I still get the answer mark for leaving my answer to question 4a as lnx = ln60 -2.5t??? dont know why i didnt go the step further tbh
10. (Original post by victoria98)
Seems like i got everything except in the normal question I got (3pi+70)/(pi+22) so got the numerator wrong somehow. My dy/dx was the same as the one floating around here somewhere. Hopefully I just rearranged wrong. What was the normal gradient?

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i don't know why but i have the same result as you
11. (Original post by CurrentFlow)
Yes, but i use volume of cylinder for height =17/2 + 1/2 = 9 Vc= pi(8)^2x9 = 576 pi and then i integrated between 17/2 and 1/2 and then subtracted the values. Is this wrong?
why are you adding 1/2 onto your k value? the x coordinate of any point on any xy plane is from the origin. youre saying that k is 17/2 with respect to 1/2 which it isnt .
12. anyone got an unofficial mark scheme?
13. (Original post by Zuzuvela)
Anyone notice the misprint on question 6?

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14. bloody hell i made stupid mistakes, i messed up differential equation and didnt use ln when i took x to the other side @@ got like 900000 minutes or something lool. also I got volume as (1024/5)(pi) but i know u had to take away the little irrelevant section and i didnt so oops
15. OMG I did AP=AE instead of AP=PE, do you think I would lose all final 7 marks??

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16. (Original post by jasonmaths)
For the 'cylinder question' i didnt minus the area - i just did the integration. How many marks is the question and how many marks have i lost? I think i got full marks on all the other questions - is this still an A*?
You mean question 7? It wasn't a cylinder because it was curved at the end
17. (Original post by immagooner)
ah no my bad its me who is doing the sum wrong i did it right in the exam jus when im re doing it now i did the sum wrong hahaa apologies, but still, should be (-1, 33/5, 16/5) and (3, 17/4, 4/5) i think ur 3 and -1 shud be a typo
i got the exact same as you, plus i used those coordinates for find PE magnitude and it came to 2root 2 so we good
18. For the decay question did anyone get t = 640

so 640 x 24 x 60 = answer in minutes?

For the last area did anybody also get 6 units^2 ?

Found the paper ok, some tricky questions but only thing i think i may have got wrong fully was the very last question.

I found the distance of the direction vector and said linda = 1

then i used the vector equation P +/- linda(direction vector) to get the two co-ordinates of B. I didn't have enough time to finish it but i knew the methodology so hope i got a few marks for it. one of the B co-ordinates i got was -4i +9j +5k
19. (Original post by 83457)
For the solids of revolution question I got 399.2 pi. I see other people for 339.2pi( the decimal version). Anybody get the same as me?
sorry its 339.2 not 399.2
20. ****ed it. Went to blow my nose for 2 minutes cuz of hayfever but ended up running out of time for the latter half of q8 - which means 10 marks down the drain. Also didn't finish the trig question so 1 mark lost. Overall looking at 64-65/75.

My offer requires an A* in Maths but with only 63-64/65 in C4 and 65-66/75 in C3 doesn't look likely.

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