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# C3 June 2016 Model Answers

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1. Wasn't too bad
Most questions were standard.
Lots would have done 6(a) the long tedious way, made algebraic errors and wasted time
9(b)(c) would probably have confused students under exam conditions.

Much easier than last year's paper.
I reckon 62ish for an A

EDIT; Check my other thread for the C4 solutions
2. fake arsey
3. (Original post by kprime2)
I genuinely love you for doing this.
What are your predictions for an A*/A?
4. (Original post by I feel myself)
fake arsey
5. (Original post by kprime2)
Most questions were standard.
Lots would have done 6(a) the incredibly long and tedious way.
9(b)(c) would probably have confused students.

I reckon 62ish for an A
missing a Q
6. (Original post by sayshay)
I genuinely love you for doing this.
What are your predictions for an A*/A?
62ish for an A
7. yeah i agree with kprime, grade boundaries should be
63/64 for an A
67/68 for an A*
8. (Original post by I feel myself)
fake arsey
Ungrateful!
9. (Original post by kprime2)
Childish too!
10. (Original post by kprime2)
Most questions were standard.
Lots would have done 6(a) the incredibly long and tedious way.
9(b)(c) would probably have confused students.

I reckon 62ish for an A
Thanks for this kprime!
Just a quick question - wasn't there another question on this paper with a proof and solving an equation in an interval? I don't think I can find it in this pdf. Sorry to bother you
11. Missing question 8?
12. (Original post by mehtj006)
missing a Q
(Original post by the_chosen_one97)
Thanks for this kprime!

Just a quick question - wasn't there another question on this paper with a proof and solving an equation in an interval? I don't think I can find it in this pdf. Sorry to bother you
(Original post by veldt127)
Missing question 8?
thanks for letting me know.

I have updated the first post. Click the googledocs link
13. On 6a, I substituted numbers that were outside x>2, would I still be allocated the marks as my A and B were correct.
14. (Original post by Craig1998)
On 6a, I substituted numbers that were outside x>2, would I still be allocated the marks as my A and B were correct.
Yes. Any two numbers > 2 to form a set of simultaneous equations would have lead to the correct answer
15. (Original post by ODES_PDES)
Childish too!
it's just banter mate
16. I did question 9 a different way, and I suspect so have others;

5 hours after first dose:

2 hours after second dose:

Same goes for part C
17. (Original post by kprime2)
it's just banter mate
Thanks for the clear solutions bud, if I have 69/75 in this what would the UMS roughly translate to? Need an A* overall

edit: seen your gb predictions, probably 92ish right?
18. (Original post by edothero)
I did question 9 a different way, and I suspect so have others;

5 hours after first dose:

2 hours after second dose:

seems fine, you get the correct answer
19. (Original post by iBall)
Thanks for the clear solutions bud, if I have 69/75 in this what would the UMS roughly translate to? Need an A* overall
92ish I reckon
20. (Original post by kprime2)
Yes. Any two numbers > 2 to form a set of simultaneous equations would have lead to the correct answer
I used x=0 and x=1 and they both lead to a=3 and b=4..

I really cant afford to lose any more marks, just realised I lost some on the differentiation for forgetting d/dx (cosx) = -sinx.

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