Are you completely sure that your value for C is correct and that you've integrated correctly?
I did part b of question 10 You don't need to integrate use the differentiated equation they give you and equate it to the inverse of the gradient as it is perpendicular .
I did part b of question 10 You don't need to integrate use the differentiated equation they give you and equate it to the inverse of the gradient as it is perpendicular .
Can you post the full question/link the paper? Would be a lot easier to help you that way
the sequence is 1, -0.5, 1, -0.5....., and because you want the sum of the first 100 terms, you can just do 50 times the sum of the first 2 terms (because each set of 2 terms is the same) so you would get 50*(1-0.5) which is equal to 25.