Chapter 5, Problem 20RE

To determine

To evaluate: The value of integral ${\displaystyle \underset{1}{\overset{4}{\int }}f\left(x\right)g\left(x\right)dx}$ by using the facts ${\displaystyle \underset{1}{\overset{4}{\int }}f\left(x\right)dx}=6$, ${\displaystyle \underset{1}{\overset{4}{\int }}g\left(x\right)dx}=4$ and ${\displaystyle \underset{3}{\overset{4}{\int }}f\left(x\right)dx}=2$ or state whether there is not enough information.