please answer the ques

Consider the graph of the function f(a) = x2 - 4. la. Write down f'(I). [3 marks] The equation of the tangent to the graph of y = f(x) at x = -2 is 2y = 4 -5x. 1b. Write down the gradient of this tangent. [1 mark] 1c. Find the value of k. [2 marks] Let f (x) = x - 8. g(x) = x1 - 3 and h (x) = f (g(z)). 2. Find h (). [2 marks] Let f (x) = 23 - 2x' + ar + 6. Part of the graph of f is shown in the following diagram. P The graph of f crosses the y-axis at the point P. The line _ is tangent to the graph of f at P