May someone please help me with my calculus review because I'm very confused?

What is the instantaneous rate of change at x = 4 of the function f (x) = ? (A) - 15 2 (D) O A O O c O D O E\fIf f (x) is continuous and differentiable and f(x) = ax" + 5x; x 5 2 (bx2 - 3x; x > 2 , then find the value of b. (A) 0.5 (B) 0 (C) 2 (D) 6 (E) There is no value of b. O A O B O C O D O EWhat is the slope of the line tangent to the graph of y = 2 In (x) at the point x = 8? (A) 76 (B) (C) (D) 16 (E) O A O B O c O D O ELet [(x) = x3 + 2x 5. What is the x-coordinate Ora point where the instantaneous rale of change of f is the same as the average rate of change of f on the interval 1