exam Maths Puzzle Numerical Ability

Can I PLEASE have some help finding the equation of the line that contains the midpoint pf AB and is perpendicular to AB.

A(2,-7), B(8,5)

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exam Other Question

Find the sum of the geometric series: 1 + 1/4 + 1/16 + 1/64...
I tried to do the series but the formula in the turorial was ocnfusing to me. Thanks for any help! Tutor Can you help me in determining whether the function is even, odd or neither even or odd?

f(x)=x-|x|