Let l = ∫4 f(x) dx, where is the function whose graph is shown. (a) Use the

Question:

Let l = ∫4 f(x) dx, where is the function whose graph is shown.
(a) Use the graph to find L2, R2 and M2.
(b) Are these underestimates or overestimates of l?
(c) Use the graph to find T2. How does it compare with l?
(d) For any value of n, list the numbers Ln, Rn, Mn, Tn, and in increasing order.