(a) Estimate the area under the graph of the function f () = 1 from : = 0 to r = 4 using a Riemann sum with n. = 10 subintervals and right endpoints. Round your answer to four decimal places. area = Number (b) Estimate the area under the graph of the function f () = = 1 I+8 from : = 0 to r = 4 using a Riemann sum with n = 10 subintervals and left endpoints. Round your answer to four decimal places. area = Number