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The function f(x) = xe "is positive and negative on the interval [ - 1,3]. a. Sketch the function on the interval. b. Approximate the net area bounded by the graph of f and the x-axis on the interval using a left, right, and midpoint Riemann sum with n = 4. c. Use the sketch in part (a) to show which intervals of [ - 1,3] make positive and negative contributions to the net area OA OD b. The net area, approximated using the left Riemann sum, is (Type an integer or decimal rounded to two decimal places as needed.) The net area, approximated using the right Riemann sum, is (Type an integer or decimal rounded to two decimal places as needed.) The net area, approximated using the midpoint Riemann sum, is (Type an integer or decimal rounded to two decimal places as needed.) c. Which interval(s) of [- 1,3] make positive and negative contributions to the net area? Choose the correct answer, O A. Positive contributions on [- 1,0); negative contributions on (0,3] O B, Positive contributions on (0,3]; negative contributions on [ - 1,0) O C, Negative contributions on [- 1,3]; no positive contributions O D, Positive contributions on [- 1,3]; no negative contributions