exam Maths Puzzle Numerical Ability

PQR is an isosceles triangle such that , QP=QR=13cm and the altitude PS=12cm . Find the length of PR ? PLS HELP . Thanks

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exam Other Question

(x)/(x^2+9x+20) - (4)/(x^2+7x+12) I am having trouble with this problem.

Thanks for any help
Rhee Please show me how to get the answer, this was a multiple choice question I had for homework?

-64^2/3

A.) 16 B.) -16 C.)1/16 D.) -1/16