book Maths Puzzle Numerical Ability

I would like to learn how to simplify the following problem

3sqrt(xy)^6
______________
x^2y

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book Other Question

fifty four minus two x equals negative eight x Hi, my name is virna and im really not sure where this question is catogorize under, but here's my question: What is the Additive inverse of a number and also, what is the absolute