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So, I'm in the Cambridge University O Level board and I'm studying for my examinations, which will be in May. I'm taking the Math 4024 paper.

I was solving the past paper for 2010 and I hit a roadblock.

Here's the link. http://papers.xtremepapers.com/CIE/...Calculator Version) (4024)/4024_s10_qp_21.pdf

It's questions 9bi, 10, 11 and 12 that are bothering me greatly.

Help?