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

Graph using the intercept method: 2x + y = 4.

I am a bit confused on this one, any help would be greatly appreciated. Thanks
factor completely

z^4-81