exam Maths Puzzle Numerical Ability

Choose values of x, then simplify it correctly.
10x^2-30x+20/x^2-1
I did something wrong on that one, maybe someone could show me how it works.

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exam Other Question

I can not figure this problem out could someone please help me?

Find the measure of < G in quadrilateral EFGH if m < E=(3x)degrees, m < F=45 degrees, m < G=(3x)degrees, and m < H=45 degrees "In the triangle ABC, measure of angle A= 60 degrees and the measure of angel C = 80 degrees. The exterior angle at B measures(x+10).

What is the value of x?"
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