In this problem you will calculate the area between f(x) = 712 and the r-axis over the interval [0, 4] using a limit of right-endpoint Riemann sums: Area = lim 1-+00 Express the following quantities in terms of n, the number of rectangles in the Riemann sum, and k, the index for the rectangles in the Riemann sum. a. We start by subdividing [0, 4] into n equal width subintervals [To, Ti], [21, T2], ..., [In-1, In] each of width Ar. Express the width of each subinterval Ar in terms of the number of subintervals n. Ar = 4n b. Find the right endpoints I1, 12, 13 of the first, second, and third subintervals [To, I,], [T1, T2], [72, T3] and express your answers in terms of n. T1, T2, 13 = (Enter a comma separated list.) c. Find a general expression for the right endpoint Th of the keh subinterval [It 1, Te], where 1