Need help with all parts B and C. Please type answers in the comments because i am unable to open attachments

The following function is positive and negative on the given interval. f(x) = sin 3x; 7,2 T a. Sketch the function on the given 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 ,2x| make positive and negative contributions to the net area. 2 -1- 2- b. Use a calculator to approximate the area. The net area, approximated using the left Riemann sum with n = 4, is (Do not round until the final answer. Then round to three decimal places as needed.) Use a calculator to approximate the area. The net area, approximated using the right Riemann sum with n = 4, is. (Do not round until the final answer. Then round to three decimal places as needed.) Use a calculator to approximate the area. The net area, approximated using the midpoint Riemann sum with n = 4, is (Do not round until the final answer. Then round to three decimal places as needed.) c. Which intervals of 2 21 make positive and negative contributions to the net area? A. Positive on 23 : negative on 3,2x O B. Positive on 3 27 : negative on 2 3 O c. Positive on [0,x]; negative on [n,2x]