book Maths Puzzle Numerical Ability

help with multiplication/division of monomials; negative exponents

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book Other Question

If 48 square inches are subtracted from the area of a square table, the result would be equal to twice the perimeter. What is the length of the side of the table?
______ feet long When you are trying to find all of the possible rational zeros, I think you are supposed to use +/- p/q. But how do you find p/q, and is that what you are supposed to use?