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# Edexcel Maths C3 watch

1. (Original post by !"£\$%)
reassuringly low... surprised january's wasn't higher...
Really? I thought Jan was very hard, the hardest in my opinion.

typically brighter students take it in Jan, which does lead to negative skew .
2. (Original post by Arsey)
here are the previous A and B boundaries

June 2005 61 53
January 2006 61 53
June 2006 56 49
January 2007 58 50
June 2007 59 52
January 2008 64 56
June 2008 64 57
January 2009 60 52
June 2009 67 59
January 2010 59 52
You dont happen to know the grade boundaries for c4 too do you?
3. (Original post by Arsey)
4 of the last 5 papers it has been 75/75 for 100UMS

check, double check, triple check!
Do you know what I need to get for 90 ums? Thanks
4. If you haven't done it yet, do the specimen paper. It is pretty challenging.
5. (Original post by mouldy)
You seem to know your stuff! what are you hoping to get tomorrow?
trying to get as much as 100 as I can. It's silly mistakes that hold me back
6. (Original post by thecityscape)
Do you know what I need to get for 90 ums? Thanks
you can work it out yourself.

Look at the grade boundaries I posted

subtract B boundary from the A boundary

add this to the A boundary to get 90UMS

add it to this to get 100UMS

However, if this exceeds 75..... then 75/75 will be 100UMS; 90UMS will then be exactly half way between 75 and the boundary for an A.
7. here is the specimen paper

have a go, if you get stuck post here.
8. (Original post by Da_hopeful_1)
C3 is going to be a nightmare. I feel like i dont know anything for it :-(
imran that wouldnt be the case IF YOU WENT TO UR LESSONS :P
9. (Original post by Arsey)
here is the specimen paper

have a go, if you get stuck post here.
Cool, I'm going to do this and then go to bed. Do you have a Mark scheme?
10. (Original post by mouldy)
You dont happen to know the grade boundaries for c4 too do you?
indeed I do

C4

June 2005 52 45
January 2006 61 53
June 2006 58 50
January 2007 58 51
June 2007 58 50
January 2008 55 49
June 2008 57 50
January 2009 59 52
June 2009 58 52
January 2010 61 53
11. (Original post by Arsey)
indeed I do

C4

June 2005 52 45
January 2006 61 53
June 2006 58 50
January 2007 58 51
June 2007 58 50
January 2008 55 49
June 2008 57 50
January 2009 59 52
June 2009 58 52
January 2010 61 53
Much appreciated rep coming your way!
12. Hi,

Can someone help me with C3 Jan 2009, Q8 part (C) and (D).

Thanks

http://dl.dropbox.com/0/view/4m89963...Jan%202009.pdf
13. In the January 2010 paper, in the last question, you get the following composite function:
fg(x) = (x - 1)^2 + 3

Wouldn't the range be fg(x) > 3, rather than fg(x) > 3, since 3 can be obtained if x = 1?

Thanks.
14. That's what I thought as well, perhaps mark scheme error.
15. (Original post by MsP)
i can never figure out how to do the 2marker question where after you put an equation in the form: R(cosx+O), it asks you what the maximum value is (which is +R), but i get stuck on where it asks "find the smallest possible x value where this maximum occurs"
how am i meant to do that?
The way I do it is:
eg. 5cos(x-53.1)
Max value will be 5 when cos(0)=1 (as you can see on the cos graph, it goes from 1 to -1 on the y-axis. So you cannot get anything higher than 5)
5cos(x-53.1)=5
cos(x-53.1)=1
x-53.1=0
x-53.1

Sorry for the rubbish explanation. Q_Q
16. (Original post by Narik)
In the January 2010 paper, in the last question, you get the following composite function:
fg(x) = (x - 1)^2 + 3

Wouldn't the range be fg(x) > 3, rather than fg(x) > 3, since 3 can be obtained if x = 1?

Thanks.
no it wouldn't the range is >3 only
17. (Original post by Arsey)
no it wouldn't the range is >3 only
why??
18. (Original post by Arsey)
no it wouldn't the range is >3 only
Why though?
19. help please 6d where has the -2 gone?

https://eiewebvip.edexcel.org.uk/Rep...e_20050620.pdf

and how do you do this
20. and 7d for above post

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