I keep getting the wrong answers. I tried different ways and they are wrong.

(a) Estimate the area under the graph of the function f (x) = - from z = 0 to x = 5 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) = - from x = 0 to x = 5 using a Riemann sum with n = 10 subintervals and left endpoints. Round your answer to four decimal places. area = Number