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# Edexcel C4 June 2016 - Unofficial Markscheme Watch

1. Can anyone give me a guess as to how many marks I'd lose for getting the limits wrong on th eQ7b integral for the volume generated y=8 and getting the final answer wrong too? And getting the wrong time for Q4? I'm thinking I'm losing anywhere from 3 to about 7 here
2. (Original post by Ramil Ahmadov)
How many marks do you think i will get for the last part of the last question if i only did until the point where you get a quadratic equation for lambda? I just didn't have time to finish it off.
You ended up with a quadratic? What method is that? I compared the magnitude of AP to the magnitude of the direction vector of the second line, and from comparing you get lambda=2/5 for the same magnitude to occur
3. how many marks was question 3 worth? It was an easy question which I carelessly messed up. I want to know how many method marks I would get or if you get method marks for this question.
4. How would method marks be allocated for the last question; I considered similar triangles and found a scale factor enlargement and multiplied it the the unit based vector of AB then added it to P to find E, my answer was a weird surd, so I definitely got it wrong, but would I definitely get 0 for the whole question?
5. Got a different position for E, how did you work them out?

Also for 4a didn't it ask us to solve the differential equation, not form it?
6. How many marks is each question worth?
7. Has anyone got the actual questions rather than just answers? Thanks
8. (Original post by somebodyelse98)
guys i put lamda as 16 but i think i integrated correctly, why did i get 16???
same. No idea what I did.

I remember multiplying 8cosxsinx by something. Which means I must have multiplied it by 2tanx? But idk where I got 2tanx from. I'm guessing I lost a mark then

(Original post by Gavrielrudolph)
The same for me. I think I got root 15 something. The angle turned out to be 67 something. Was that similar to yours?
That's what my friend did. I think you just worked out the wrong angle somehow. You could do 90- 67.(whatever) to get the actual answer. But if your angle is the wrong angle then surely you must have made the original error in a previous part to the question?
9. Are you sure about 7d), the shade region should be in the form of x-y(pi), where x and y are constants i don't know.
10. I think I forgot to integrate the partial fractions lol :')
Do you think 65 for C3 and 72 for C4 would be enough for an A*?
11. (Original post by angoranimi)
I think I forgot to integrate the partial fractions lol :'
Do you think 65 for C3 and 72 for C4 would be enough for an A*?
depends what you got in c1 c2 and the 2 other modulus
12. Is someone able to tell me how many marks each question was...thanks
13. How many marks would I lose if I wrote all the correct working for the final vectors question but did not have time to actually sub in 2/5 and work out the coordinate?
14. (Original post by angoranimi)
I think I forgot to integrate the partial fractions lol :'
Do you think 65 for C3 and 72 for C4 would be enough for an A*?
I reckon so
15. Full worked solutions: http://www.thestudentroom.co.uk/show....php?t=4185241
16. What would you guys say 66 or 67 would be?

Like what UMS??????????
17. Hey gus for the differential equation qiestion , I left it in terms of ln , how many marks do you think ill lose . Also do you think ill lose a marl for not cancelling 8pi/6 to 4pi/3
18. (Original post by Asurat)
Can anyone give me a guess as to how many marks I'd lose for getting the limits wrong on th eQ7b integral for the volume generated y=8 and getting the final answer wrong too? And getting the wrong time for Q4? I'm thinking I'm losing anywhere from 3 to about 7 here

For question 4 when you say the wrong time this will depend whether you calculated the time correct in hours but didn't convert to minutes - in which case you'd lose the final A1 mark.

For question 7 for the integral you'll likely use 2 marks for this- M1 mark for calculating the volume, and the A1 mark for getting the incorrect volume. You may lose a further mark depending on how many marks this question was worth, and if your final answer was incorrect then your may have made another error in your method ?

I'd say to be safe you've lost 5-6 marks here.
19. Wud a 69 in c3 nd a 66 in c4 be an A*?
20. (Original post by Turtlebunny)
What would you guys say 66 or 67 would be?

Like what UMS??????????
You're looking at a mid to high B, seeing as the grade boundaries WILL skyrocket. An A will be 68/69.

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