4. Let at) 2 i on the interval [2, 7], and n = 5. (a) Sketch the graph of the function on this interval. (b) Calculate the width A2: of the the 5 subintervals, and compute the gridpoints m0, m1, . . . .225. (c) Illustrate the midpoint Riemann sum by sketching the appropriate rectangles on your graph from (a). (d) Calculate the corresponding sum. Explicitly write out the area of each rectangle, then use a calculator to add them together