(a) Estimate the area under the graph of the function f (z) = from z = 0 to z = 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 (x) = TLg from z = 0 to z = 4 using a Riemann sum with n = 10 subintervals and left endpoints. Round your answer to four decimal places area = Number