Chapter 16.2, Problem 92E

Related integrals Evaluate each integral

a. ${\displaystyle {\int }_0^4{\displaystyle {\int }_0^4\left(4-x-y\right)}dxdy}$

b. ${\displaystyle {\int }_0^4{\displaystyle {\int }_0^4\left|4-x-y\right|}dxdy}$