book Maths Puzzle Numerical Ability

Simplify the Expression

(((16 ^5/4)))


(((125 ^-2/3)))

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book Other Question

the measure of the second angle of a triangle is 21 degrees more than the measure of the first angle. The measure of the thirs angle is 15 degrees less than the measure of the firs 9x^2=64
9x^2=squre rt of 64
9x^2=8

I am stuck after this