If $G$ is the rectangular solid that is defined by $1x3,2y5,-1z1,$ and if $f(x,y,z)$ is continuous on $G,$ then ${}_{G}f(x,y,z)dV={\displaystyle \underset{1}{\overset{3}{}}}{\displaystyle \underset{-1}{\overset{1}{}}}{\displaystyle \underset{2}{\overset{5}{}}}f(x,y,z)dydzdx$