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Edexcel C4 June 2016 - Unofficial Markscheme

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1. How many marks was question 4 all together?
2. How exactly did you determine the values for the final vector question? Pls help it will allow me to ascertain how many marks I may have lost
3. (Original post by Mattematics)
xx
Thanks for making this - great markscheme! I've tweeted it out so lots of people can see it
4. Agree with all
5. (Original post by Kay Fearn)
How many marks was question 4 all together?
7 xx
6. Soooo confused, why is the height of the cylinder 8!?!? literally need to see the question again because i'm sure the height was 9?
7. I somehow did t in terms of x... How many will I lose?

Your thread seems a lot more accurate than mine, I'll delete my one
8. never fear the top hat is here, i am here to correct ur mistakes xd
9. Why did I get 3Pi+31/Pi +11 instead of 3pi+ 62/Pi + 22???
10. For the volume on 7b I got something like
11. How marks do you think I'll have lost if for the last part of question 8 I had lamda as 5/2 not 2/5 ? The question was out of 5
12. [QUOTE=Engineerrookie;66068573]
(Original post by Mattematics)
Pretty sure every answer is now correct. Enjoy
Question 3:
Spoiler:
Show
Isn't the answer 3Pi + 31/ Pi + 11????
I think i got the same as you!!
13. (Original post by The_Big_E)
For 5a, it was dy/dx = -5root3/16, not x
How many marks was question 4?
14. [QUOTE=huwgerard1;66068949]
(Original post by Engineerrookie)

I think i got the same as you!!
I can't understand why it would be wrong tbh

If x= 3 and y= 1/2 and we are finding where the normal to curve at that point intersects the x axis
15. 7 a) k was -8.5 i double checked it into original equation
16. for question 7d, i did not put an exact value instead i got 2.something
17. (Original post by ombtom)
18. Full marks

Makes up for C3.
19. (Original post by Sapereaude54)
How exactly did you determine the values for the final vector question? Pls help it will allow me to ascertain how many marks I may have lost
Spoiler:
Show
Let E be a general point on the line

So

Find PE:

So

Now we know that

Therefore the lengths are the same, as the length of

You know that

Then use this lambda with the general point equation
20. Wohooo I *think* I might have got 100% based on these answers Defo made up for that C3 washout haha.

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