(a) Estimate the area under the graph of the function f (x) = from x = O to subintervals and right endpoints Round your answer to four decimal places. from = O to z -4-5 area = Number _ 3 using a Riemann sum with n = 10 _ 3 using a Riemann sum with n = 10 (b) Estimate the area under the graph of the function f (c) = subintervals and left endpoints. Round your answer to four decimal places. area = Number