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# Edexcel Maths C3 watch

1. It doesn't matter what method you do it by as long as you show your method and get the right answer.
2. Anyone want to give me their thoughts on how I did last question? I would be ever so grateful if someone could estimate how many marks I will get on the last question I explained what I did on the last page I think.
In june 09, 45 was the lowest boundary for a D. In Jan 09, 45 was the lowest C boundary. I feel this paper was in the middle, so i wouild estimate a D.
Ah thank you! Hopefully that's enough then, I need a C overall and C4 isn't looking anywhere near a D. Maybe my A in C1 and M1 will cushion me a bit!
4. (Original post by Varciani)
Ah thank you! Hopefully that's enough then, I need a C overall and C4 isn't looking anywhere near a D. Maybe my A in C1 and M1 will cushion me a bit!
ah that's ok glad to help. GOOD LUCK WITH LIFE.
ah that's ok glad to help. GOOD LUCK WITH LIFE.
Thanks, you too
Yes. i got the right answer by using the qoutient rule. you'll just as many marks and people who used the chain rule and got it wrong
im sure i used the quotient rule correctly, how didnt i get the right answer??
7. (Original post by Arsey)
no one will know this until the results are released.
i said past lol
8. (Original post by cenan)
know this isnt exactly correct, but past 90 UMS have been the 80 UMS raw mark boundary, divided by 80, times by 90. This is not the exact formula, however, for the past 3 or 4 years if u do this to the 80 UMS boundary that will be the 90 UMS boundary. so say this year the ums boundary is 60 for an A, than the 90 UMS should be somewhere around 60/80 times 90 which is 68 or so.
thanks
9. can anyone giv me a link to the unoffical ms pl0x?
10. ...ie, half way between the A grade boundary and full marks. It's not that genius.
11. (Original post by Andamiriel)
thanks
Arsey just said that the above isn't true, and he's proven to be a reputable source, so I'd take it with a large shakerful of salt.
12. (Original post by Arsey)
I would say you will lose a method and accuracy mark.
Sorry to quote you but you know your stuff.
I made 3 mistakes on the paper. The turning points i only found the x co ordinates, miss read Exact for x. Got the x ones right though, how many marks do i lose?
I only worked out 1 value for 7d (126 mins) and didn't put a time, just the mins, how many marks will i lose there
And finally i got the range of G to be <-3 but missed the upper limit, is that 1 or 2 marks lost?
Thanks
13. (Original post by Smeh)
I know right,.
I'm just lucky I already have 89 from january.
Think positive people we're gonna bang out c4 and get 100!
Who's with me?!
Yep, got 87/100 in jan, so now i'm gunna go for 93 in C3, cause im not sure if i boosted.
I find C3 easier too, it's just plain integration ...
14. I got 7 right but answered the final part in full minutes, and not hours and minutes. I won't get marked down for that will I? Because the wording of the question was fairly ambiguous
15. (Original post by Robbyv)
Sorry to quote you but you know your stuff.
I made 3 mistakes on the paper. The turning points i only found the x co ordinates, miss read Exact for x. Got the x ones right though, how many marks do i lose?
I only worked out 1 value for 7d (126 mins) and didn't put a time, just the mins, how many marks will i lose there
And finally i got the range of G to be <-3 but missed the upper limit, is that 1 or 2 marks lost?
Thanks
potentially you could lose 2 accuracy marks for the coordinates

you will lose at lease 2 marks for the time qu

do you mean >= -3; if so you should lose just 1 mark if the working was clear.
16. (Original post by Speckle)
...ie, half way between the A grade boundary and full marks. It's not that genius.
half way between the A boundary and the boundary for 100UMS to be precise (this isn't necessarily 75/75).
17. (Original post by satyajit)
can anyone giv me a link to the unoffical ms pl0x?
check out post 369 - nice mathematical one to remember
18. ive lost between 9-11 marks. If its 60 for an A, ive got about 85 then! annoyed with silly mistakes. also are we sure the last question, that the only way to do the question is the method in the mark scheme? i did it differently, taking e to both sides hence cancelling the ln's out and then just using algebra to get x in terms of e!
19. also, does everyone agree that the mark scheme is completely correct?
20. Well.. I think I didn't screw up Q7 quite as much as I thought I did.. certainly won't get full marks for it but might get quite a few method marks I'm hoping and I did find the correct time in the end! I was certain something went wrong as I got two times... do you think it matters if you didn't convert it into hours and minutes and just left it in hours? I also used the chain rule rather than the quotient in Q5 (I wish I'd used the quotient.. that probably would have been much simpler and less confusing) but I think I got the same answer so I doubt that'll matter.
And for some stupid reason I didn't fully rearrange my answer to 8b and didn't fully rearrange my answer to question 2 either (I have no idea why I didn't gah..) but all in all not too bad.

I did love all the graph questions in this paper and I thought it was a hell of a lot better than January's one.

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