Estimate the area of the region bounded by the graph of f(x) = x + 4 and the x-axis on [0,10] in the following ways. a. Divide [0,10] into n = 4 subintervals and approximate the area of the region using a left Riemann sum. Illustrate the solution geometrically. b. Divide [0,10] into n = 4 subintervals and approximate the area of the region using a midpoint Riemann sum. Illustrate the solution geometrically. c. Divide [0,10] into n = 4 subintervals and approximate the area of the region using a right Riemann sum. Illustrate the solution geometrically. a. The left Riemann sum is (Type an integer or decimal rounded to three decimal places as needed.)