need help please

Find the average rate of change of the function over the given intervals. f(x) = 6x +6; a) [5,7], b) [-4,4] a) The average rate of change of the function f(x) =6x* + 6 over the interval [5,7] is (Simplify your answer.) b) The average rate of change of the function f(x) = 6x* + 6 over the interval [ - 4,4] is (Simplify your answer.)a. For the function and point below, find f'(a). b. Determine an equation of the line tangent to the graph of fat (a,f(a)) for the given value of a. f(x) = 4x-+4x, a= -2 a. f' (a) = b. y=