Edexcel A2 C4 Mathematics June 2016 - Official Thread

OK these are my answers can anyone add to/correct them?

1) didnt write it down
2) A= 1.083
exact = 8/3l(2)-1
3) 3pi+62/pi+22
4) x=60e^-5/2t
t= 633 mins
Q?? -2ln(y)+3ln(3y+2)
6??) lambda=8
area = -3root3 -4/3pi
Volume of rev question k=17/2
V= 1696/5 pi
Parametric question m=-5root3 / 16
x=4 y=5root3
8) costheta=4/5
length=2root2
area= 2.4
E= (-7,28/5,21/5) (-3,12/5,9/5)

wont all be correct and cant remember which order they were in too well but its a start

Would 71 on C3 and 68 on C4 be A* overall do people think?

No problem haha i was quite disappointed as i thought i'd got 100. But as long as i get the A* it that should be fine.

Looks good, but you can't have a negative areaa in question 6 and I can't say what the last one is.

sameee I put SO much work into maths but I'm losing the marks because of careless mistakes.... kinda sucks haha
Anyway I hope you'll get the grades you need!!!

Can someone remember what the differential equation was asking? I don't need the answer just the question...

somehow i got c to be -720. Can anyone explain why i got this
I split the fraction so i had
1/ -5/2x dx = 1 dt
the integrated them both
not sure if i was only meant to divide the x and leave the -5/2

Do examiners allow marks for errors carried forward across parts of a question?

Would 65/75 C4 and 68/75 C3 be an A*. Trying to find worst case scenario ?????
Thanks


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OK these are my answers can anyone add to/correct them?

1) didnt write it down
2) A= 1.083
exact = 8/3l(2)-1
3) 3pi+62/pi+22
4) x=60e^-5/2t
t= 633 mins
Q?? -2ln(y)+3ln(3y+2)
6??) lambda=8
area = -3root3 -4/3pi
Volume of rev question k=17/2
V= 1696/5 pi
Parametric question m=-5root3 / 16
x=4 y=5root3
8) costheta=4/5
length=2root2
area= 2.4
E= (-7,28/5,21/5) (-3,12/5,9/5)

wont all be correct and cant remember which order they were in too well but its a start