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Let f(x ) = 10 - 2x . (a) Sketch the region R under the graph of f on the interval [0, 5]. y 10 N O Find its exact area (in square units) using geometry. square units subintervals. (b) Use a Riemann sum with five subintervals of equal length (n = 5) to approximate the area (in square units) of R. Choose the representative points to be the right endpoints of the square units (c) Repeat part (b) with ten subintervals of equal length (n = 10). square units (d) Compare the approximations obtained in parts (b) and (c) with the ex ct area found in part (a). Do the approximations improve with larger n? O Yes O NO