exam Maths Puzzle Numerical Ability

A circle has a diameter with endpoints (-8,-1) and (-3,13). Find the center of the cicle. Find the area of the circle.

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exam Other Question

Please explain why it is that -3^4=-81(a negitive number),
yet, -(3)^4=81, a positive number.
Is it because 2 negitives= a positive? Hi! I need some help to solve
4(x+5)-8x=-2(x-2)
and
5-x=3(2-x)+2x

Thanks so much for your help