Chapter B, Problem 30E

(a)

To determine

To Calculate: The value of the definite integral ${\displaystyle \underset{1}{\overset{2}{\int }}xdx}$ using Riemann sum definition.

(b)

To determine

To calculate: The value of the definite integral ${\displaystyle \underset{0}{\overset{4}{\int }}3xdx}$ using Riemann sum definition.