In 15 words or fewer, describe the steps for evaluating a rational expression when you know the value of the variable.

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Explain how you can use the associative property to evaluate (7x50)x4.

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).