book Maths Puzzle Numerical Ability

The sum of a certain number and second number is -42. The first number minus the second number is 52. Find the numbers.

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book Other Question

Casey has 10/8 pan of brownies. He is going to give each child a portion of size 3/4 of a full pan. How many children can he serve? What part of the portion is left over? I need help in answering this problem:
(2x^2 + y^2)^2
I have to simplify it.