book Maths Puzzle Numerical Ability

How do you do this (2x^5 y^3)^2(x^2 y^6)^3

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book Other Question

f(x)=-2x g(x)= -2x-1

please help

thanks 2 t
--- = ----
t 5t-12

on this one you take 2 divided by t = t divided by 5t-12
I just need to know what to do with this problem. Thanks.