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

Solve the equation by finding all real roots.
x^3-7x+15x-9=0

i have this

1 -7 15 -9 /(divided by) 1.

x^2-6x+9
(x+1) (x^2-6x+9)
it says factor again and where is the soultion Jerry needs to raise his batting avg. So far he has 20 hits in 100 times at bat for .200 batting avg. How many consecutive hits does he need in order to raise his avg to at least .250? Solve. Write an equation