Chapter 5.4, Problem 207E

In the following exercises, evaluate the triple integrals over the bounded region $E=\left\{\left(x,y,z\right)|\left(x,y\right)\in D,u_1\left(x,y\right)x\le z\le u_2\left(x,y\right)\right\},$ where D is the projection of E onto the xy —plane.

207. ${\displaystyle \underset{D}{\iint }\left({\displaystyle \underset{1}{\overset{2}{\int }}\left(x+z\right)dz}\right)dA.}$ where $D=\left\{\left(x,y\right)|x^2+y^2\le 1\right\}$