Estimate the area of the region bounded by the graph of f(x)=x +4 and the x-axis 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 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.) Sketch the graph of f and the rectangles used in the left Riemann sum. Choose the correct graph below. O A. 48- 7.5 X O B. 48- 0- 0 7.5 b. The right Riemann sum is (Type an integer or decimal rounded to three decimal places as needed.) Sketch the graph of f and the rectangles used in the right Riemann sum. Choose the correct graph below. O A. Ay 48- مخملييملمم 7.5 LY O B. 48- 7.5 X X G O C. 48- OC. 48- 0 7.5 7.5 X ♫ E E