Name 2 types of subtraction

Which of the following expressions is equal to 2x^2+8

Create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1.

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.