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Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)

Let f(x) = 3 − x . find the average rate of change of f(x) from x = a to x = a + h and simplify your answer so that no single factor of h is left in the denominator.

Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122