Let f(x) = x2, and compute the Riemann sum of f over the interval [3, 5], choosing the representative points to be the midpoints of the subintervals and using the following number of subintervals (n). (Round your answers to two decimal places.)   (a) two subintervals of equal length (n = 2) ??   (b) five subintervals of equal length (n = 5) ??   (c) ten subintervals of equal length (n = 10) ??

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