book Maths Puzzle Numerical Ability

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

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I would like to learn how to simplify the following problem

3sqrt(xy)^6
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x^2y Beth ate at a steakhouse. The cost of the meal plus a 15% tip was $42.50. What was the cost of the meal before the tip was added?