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

triangle ABC is an isosceles triangle with vertex angle B, AB = 5x - 28, AC = x + 5, and BC = 2x + 11. Find the length of the base. I have no idea what this could be: y=2^x and y=log2x
It says to identify the graph that represents the corresponding function.
The lines are (1, -3) (0,0) (-5,1)
I really do