(a) Estimate the area under the graph of the function f (I) = - 1 from I = 0 to r = 3 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 () =T 1 from I = 0 to x = 3 using a Riemann sum with n = 10 subintervals and left endpoints. Round your answer to four decimal places. area = Number