(a) Estimate the area under the graph of the function f (x) = - 1 x+4 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 ac = 0 to ac = 2 using a Riemann sum with n = 10 subintervals and left endpoints. Round your answer to four decimal places. area = Number