exam Maths Puzzle Numerical Ability

I am having a hard time solving a proof when lines are perpendicular in a triangle!

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exam Other Question

1) find F(0) when f(x)=x^2-5x-7
2) Find F(17) when f(x)=|x-16|



all help is appreciated
Can you help me solve this equation?

P = 2L + 2w

w =