Can someone explain this to me? i’m so confused as to what i’m doing here.. marking brainliest

Complete the standard form of the equation that represents the quadratic relationship displayed above, where a, b, and c are rational numbers.

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.

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8