exam Maths Puzzle Numerical Ability

When you are working with Integers in Math, how do you solve Multiplication using like and unlike signs?

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exam Other Question

A man at ground level measures the angle of elevation to the top of a building to be 53 degrees. If at this point he is 12 feet from the building, what is the height of the buildi simplify

2/x+3 + 4/x+7 / 3x+13 / x^2+10x+21