(D).(A).(B) From the Riemann Sum, we see , then . Notice that
the term involving k in the Riemann Sum is not equal to . Thus,
we will choose , so a = 0 and , so b = 1. Since xk
replaces giving the integral .(C) See the figure below. About the x-axis: Washer. ΔV = π (y^2 − 1^2 ) Δx,