exam Maths Puzzle Numerical Ability

Can someone please help me to simplify this without negative exponents?
(xy^5 / x^-4y^2)^-2

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exam Other Question

Section 9.6 # 45

Geometry. The length of one leg of a right triangle is 3 in. more than the other.If the length of the hypotenuse is 15 in., what are the lengths of the two legs?
Solve.

9/x-5 -1 = 8/x+5
Can anyone help me figure these fractions out, so i CAN HAVE A FORMULA for future references, the slashes are fraction bars.