book Maths Puzzle Numerical Ability

how do i find this? whats the answer? evaluate -4 2
3 6

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I would like to learn how to simplify the following problem

3sqrt(xy)^6
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x^2y Christine works at the Mountain View Restuarant on weekends. A customer left her a tip of $2.55 in quarters, dimes, and nickels. She was given 18 coins in all. How many coins of ea