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Edexcel C4 June 2016 - Unofficial Markscheme

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Reply 20
Avatar for iBall
iBall
10
Thoughts on A* boundary and full UMS?
Original post by iBall
Thoughts on A* boundary and full UMS?


Probably 74 full UMS and 67/68 for 90.
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
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.
Reply 24
Avatar for Anon-
Anon-
6
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
(edited 7 years ago)
Reply 25
Avatar for iBall
iBall
10
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 😁
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
Reply 27
Avatar for HJS14
HJS14
1
For 5a, what was the given equation for Y. X was x=4tant, cant remember y
Reply 28
Avatar for hazzam
hazzam
1
Original post by Mattematics
Pretty sure every answer is now correct. Enjoy :smile:

Question 1:

Spoiler

Question 2:

Spoiler

Question 3:

Spoiler

Question 4:

Spoiler

Question 5:

Spoiler

Question 6:

Spoiler

Question 7:

Spoiler

Question 8:

Spoiler



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?
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?
Reply 30
Avatar for Anon-
Anon-
6
Original post by HJS14
For 5a, what was the given equation for Y. X was x=4tant, cant remember y


y=5root3sin2t
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. :frown: i had problem with time man **** or i would have corrected it.

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Reply 32
Avatar for Anon-
Anon-
6
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
Original post by Mattematics
Pretty sure every answer is now correct. Enjoy :smile:
Question 3:

Spoiler

Isn't the answer 3Pi + 31/ Pi + 11????
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.
wasn't lambda = 16? then it changed to 8 outside the integral when you did the second part?
Reply 36
Avatar for HJS14
HJS14
1
Original post by Anon-
y=5root3sin2t


Thanks, and what was y in the given co-ordinates?
Can't someone remind what questions 6d and 7 were please ?
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?
Reply 39
Avatar for izzyrut
izzyrut
Anyone know how many marks 2b was worth? (Trapezium rule)


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