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# Edexcel C3 June 2016 - Unofficial Mark Scheme

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1. (Original post by Student7th)
Ahah was aiming for an A*, depends how I actually did yesterday (waiting for an unoffical MS with working so I can see) but I don't mind an A as I can retake if I need to. Yeah, I will do that, best of luck for any of your remaining exams!
There are worked solutions in the first post of this thread
I got a different answer for 5i.
Does anyone remember the qs?
Did you get 0.1609? I got that
3. (Original post by 13 1 20 8 42)
There are worked solutions in the first post of this thread
How do I find them?
4. (Original post by Yuanghf)
How do I find them?
You go to the start of this thread..
5. (Original post by Yuanghf)
Did you get 0.1609? I got that
I got that too
6. (Original post by jamessmith15)
for the last question why did i get a=-5 and b=0.5
The only thing I can think of is you must have also had e rather than e^-1, so it could change to:

-5ln(0.5+0.5e)
=5ln((0.5+0.5e)^-1)
=5ln(2+2e^-1)
7. Anyone know when someone will be releasing the actual full paper with worked solutions (if at all)?
8. (Original post by Yuanghf)
Did you get 0.1609? I got that
9. (Original post by Mike2708)
Anyone know when someone will be releasing the actual full paper with worked solutions (if at all)?
kprime will upload model solutions today I believe
In the mean time, the paper is somewhere on this thread, believe it's page 20something, and solutions are right at the start of this thread, combine them for profit..
10. (Original post by Mike2708)
Anyone know when someone will be releasing the actual full paper with worked solutions (if at all)?
Worked solutions are on page 1 of this thread, questions are on page 22
11. (Original post by veldt127)
I'm not 100% sure on all of these, but I think most are correct.

Question 1
Spoiler:
Show
A. -5, 6
B. 6
Question 2
Spoiler:
Show
A. (20-4x^2)/(x^2+5)^2
B. >sqrt(5), <-sqrt(5)
Question 3
Spoiler:
Show
A. R= sqrt(5)
a= 26.57°
B. 33.0°, 273.9°
C. 86.1°
Question 4
Spoiler:
Show
Ai. 21
ii. ln(2.5)
iii. 25
B. Show that question
C. 1.4368, 1.4373
D. Show the root was in [1.4365, 1.4375]
Question 5
Spoiler:
Show
i. 0.9463
ii. 0.5cosec(4Y)
Question 6
Spoiler:
Show
A. A=3, B=4
B. Normal eqn. -0.5x + 17.5
Question 7
Spoiler:
Show
A. graph of arcsin, sort of a rotated S shape. Went through (0,0), (-1,-pi/2), (1,pi/2)
B. -1-0.5sqrt(3)
Question 8
Spoiler:
Show
A. Trig proof
B. -2.848, -1.277, 0.294, 1.865
Question 9
Spoiler:
Show
A. 6.740 - dose after 4 hours
B. show that dose equalled a value after 7 hours
C. 5ln(2 + 2e^-1)
A = 5, B = 2
PDF with full worked solutions : http://www.thestudentroom.co.uk/atta...7&d=1466526735
3c:
Attachment 554421
Hi do you know the marks for each question please?
12. (Original post by Taylorgraham)
Hi do you know the marks for each question please?
Literally on the page before this one.
Q1a) 4 marksb) 1 markQ2a) 4 marksb) 3 marksQ3a) 3 marks b) 5 marksc) 2 marksQ4a) 5 marksb) 2 marksc) 2 marks d) 2 marksQ5i) 5 marksii) 5 marksQ6a) 4 marksb) 5 marksQ7a) 2 marksb) 3 marksQ8a) 4 marksb) 6 marksQ9a) 2 marksb) 2 marksc) 4 marks
13. (Original post by kprime2)
where are the questions
Questions are on page 22, are you posting the answers today bro?

http://www.thestudentroom.co.uk/show....php?t=4180932
15. Thanks I'll add them to the main post
16. Guys can someone help me with 7b?
17. Guys for 8b I wrote 3/2 cotx instead of 3 cotx at the start and carried on with the wrong equation, do i lose all 6 marks? And what mark do you think for an A?
18. for question 2a, it says simplest form, but do I lose a mark if I take out 4? like the numerator will be 4(5-x^2) ?
19. (Original post by lawlieto)
for question 2a, it says simplest form, but do I lose a mark if I take out 4? like the numerator will be 4(5-x^2) ?
I would think that's expanding it so you would lose a mark. I think it depends on the person whos marking it, if they're feeling geneours or not.
20. I lost about 12/13 marks on really stupid mistakes, is it possible to make up for this in C4 to get an A*?

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