Complete the following steps for the given function, interval, and value of n. a. Sketch the graph of the function on the given interval. b. Calculate Ax and the grid points X X X c. Illustrate the left and right Riemann sums. Then determine which Riemann sum underestima d. Calculate the left and right Riemann sums. f(x)=3x for [2.5]; n=6 a. Sketch the graph of f(x)=3x on the interval [2,5]. Choose the correct graph below. A. Q a G B. 0 Q Q