Chapter 8, Problem 12CRQ

To determine

To fill: “If $f\left(x,y\right)$ is continuous and nonnegative over a region R in the xy-plane and ${\displaystyle \underset{R}{\iint }f\left(x,y\right)}dA$ exists, then the double integral gives the ______ of the ________ bounded by the graph of $f\left(x,y\right)$ over the region R”.