If r (x) = x^3-x^2 +x and s (x)=-x, which expression is equivalent to (r/s)(x)?

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Three times the sum of a number and seven is negative thirty-six. what is the number?

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.