(a) Estimate the area under the graph of the function f (a) =- 1 from x = 0 to x = 2 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 (a) = - from x = 0 to c = 2 using a Riemann sum with n = 10 subintervals and left endpoints. Round your answer to four decimal places. area = Number