Find the average rate of change of the function from x1 to x2. Function x-Values Function _________________________

Question:

Find the average rate of change of the function from x1 to x2. Function x-Values
Function _________________________ x-value
1. f(x) = −2x + 15 ...................... x1 = 0, x2 = 3
2. f(x) = x2 − 2x + 8 .................... x1 = 1, x2 = 5
3. f(x) = x3 − 3x2 − x ................. x1 = −1, x2 = 2
4. f(x) = − x3 + 6x2 + x ................ x1 = 1, x2 = 6