I saw Mathemateg's c3 markscheme. I think I got 68 or 69 /75. I panicked on the circles question and didn't spot it was simple SOHCAHTOA I think c4 went a little better for me today - does anyone know if mathemateg will be doing a markscheme this afternoon or not until Monday?
ahhhh thats annoying i worked out b and got 1.5 too, then for some stupid reason crossed it out and decided to do it in a weird way.. t=2 when V=A/2 so i put those into the equation and we needed to find t when V=A/4 which i put as V=1/2(A/2) and then subbed in the expression i had found for A/2
Yeah I totally agree! Although I wouldn't worry if you don't have every line of workings exactly like mathemateg's solutions. I think the examiners would award method marks accordingly as you progress through a question, so if you skip a line of workings, they'd more than likely assume your knowledge and award the mark
What did everyone for for the volume of revolution question? And the integration by substitution?
Volume was 3.73 I believe. Integration by substitution was 38/15.
As I've said before though, there are really no excuses for getting either wrong since your calculator can do the definite integral numerically so you know when you get it right.
I got all the step above right but didn't get that as the final answer, how many marks do you think I lost?
If you integrated sin2x incorrectly then you'll probably get 3 or 4/6 marks. If you got the integration completely correct but then typed the numbers on your calculator wrong, probably 5/6
If you integrated sin2x incorrectly then you'll probably get 3 or 4/6 marks. If you got the integration completely correct but then typed the numbers on your calculator wrong, probably 5/6
Volume was 3.73 I believe. Integration by substitution was 38/15.
As I've said before though, there are really no excuses for getting either wrong since your calculator can do the definite integral numerically so you know when you get it right.
My guesses for boundaries based on this: 100ums 64-65 / 75 80ums 54/75 70ums 48/75
I think it will be slighly higher than last year's simply because we had more hard past paper qs to prepare. Similar to the difficultly of June 2013 imo