for questio 7 if you got the right answer but didnt use the method which will probably be on the markscheme ( the traingle one) would you still get the marks? i ended up using sin^2 +cos ^2 =1 and then devided by cos^2 and did a whole bunch of other stuff but i seem to have the same answer as everyone else so will i still get the marks?
For the question:
sin b =3/7 . what is cos b equal too considering it is an obtuse angle
i did c=sqrt(a^2+b^2)
sin = opposite/hypotenuse
so the adjacent length is 2*sqrt(10)
so, cos b = 2*sqrt(10)/7
the angle is obtuse so,
pi-(2*sqrt(10)/7)= cos b (as an integer, 154 degrees)
is this definitely the right answer?
also i did all that but i put:
Do you think ill only lose one mark?
Also on question 9, it said: 'List the values of y which allow the sequence to have a sum to infinity'
(or words to that affect)
i put 0<y<1 because a log cannot be a negative value
Anyone got an unofficial mark scheme by any chance?
hey , i think i did ok(ish) on C1 and C2 , i am aiming for an A and think i was on the boundaries (High B, Low A) for both this week.... But, i have been doing mocks im stats and been getting around 90% ... could i still realistically get an A overall if i repeat that next week (not sure how the grading system works) thanx
(Original post by peachesandcream77)
what's usually an A? Around 57 - 62?
think 58 for an A, its usualy 80% but sometimes they can say 57 is an A so i guess just depends on what they decide but if you look at the most recent grade boundaries for jan 2012 it was 60 for an A in c2 but thats higher than normal xD