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# Edexcel C4 June 2016 - Unofficial Markscheme

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1. Thoughts on A* boundary and full UMS?
2. (Original post by iBall)
Thoughts on A* boundary and full UMS?
Probably 74 full UMS and 67/68 for 90.
3. (Original post by iBall)
Thoughts on A* boundary and full UMS?
I predict full UMS 75, 90UMS 69-70. I'd be tempted to guess 70 though
4. Can anyone tell me how many marks I will get for this:

So when working out costheta, I somehow got 15/20, and then I did 1/2absinc using the value of theta from that part, so I got like 2.65. Out of the 5 marks for the 2 parts, how many will I get? Because I believe I should get ecf marks.
5. oh ****, I think I got 4 a) wrong. does anyone remember what the question was?

Edit: nvm, I put e^(-2.5t+ln60). how much marks do you think I would lose? i'm thinking just A1
6. (Original post by Mattematics)
Probably 74 full UMS and 67/68 for 90.
(Original post by Patrick Gekko)
I predict full UMS 75, 90UMS 69-70. I'd be tempted to guess 70 though
Fair, hoping for 74 as the max then 😁
7. (Original post by Anon-)
oh ****, I think I got 4 a) wrong. does anyone remember what the question was?
dx/dt = -(5/2)x

Find x in terms of t given when t = 0 x = 60
8. For 5a, what was the given equation for Y. X was x=4tant, cant remember y
9. (Original post by Mattematics)
Pretty sure every answer is now correct. Enjoy

Question 1:
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Question 2:
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Question 3:
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Question 4:
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Question 5:
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Question 6:
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Question 7:
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Question 8:
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cos(theta) was 4/5. Left it out by mistake.
Got exactly the same but for 6b I bought the 3 up as a power and the same with the 2 and then used law laws to make them as a fraction in a single ln. Would that be fine?
10. for Q6 on the prove that the integral = k (integral) sin^x i got 1/8 (integral) sec^2x. WHere did i go wrong and how many marks would i get for part B for carrying the k = 1/8 instead of using k=8?
11. (Original post by HJS14)
For 5a, what was the given equation for Y. X was x=4tant, cant remember y
y=5root3sin2t
12. I found area instead of finding volume for q6b. And quite sure my area is right. I also wrote S(Area)=blahblah Lol. How many marks will i get out of 4. i had problem with time man **** or i would have corrected it.

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13. (Original post by hazzam)
Got exactly the same but for 6b I bought the 3 up as a power and the same with the 2 and then used law laws to make them as a fraction in a single ln. Would that be fine?
yes
14. [QUOTE=Mattematics;66067683]Pretty sure every answer is now correct. Enjoy
Question 3:
Spoiler:
Show
Isn't the answer 3Pi + 31/ Pi + 11????
15. (Original post by hazzam)
Got exactly the same but for 6b I bought the 3 up as a power and the same with the 2 and then used law laws to make them as a fraction in a single ln. Would that be fine?
Should be.
16. wasn't lambda = 16? then it changed to 8 outside the integral when you did the second part?
17. (Original post by Anon-)
y=5root3sin2t
Thanks, and what was y in the given co-ordinates?
18. Can't someone remind what questions 6d and 7 were please ?
19. What was the value for Cos(theta) in the vector question? I got 4/5 but it says here that k=2...... Im missing something right?
20. Anyone know how many marks 2b was worth? (Trapezium rule)

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