Estimate the area of the region bounded by the graph of f{x) = x2 + 3 and the xaxis on [0,6] in the following ways. a. Divide [0,6] into n = 4 subintervals and approximate the area of the region using a left Riemann sum. Illustrate the solution geometrically. b. Divide [0.6] into n = 4 subintervals and approximate the area of the region using a midpoint Riemann sum. Illustrate the solution geometrically. c. Divide [0,6] into n = 4 subintervals and approximate the area of the region using a right Riemann sum. Illustrate the solution geometrically