Please help, thank you

Problem $1$: Use MATLAB and the integral$2()$ function $to$ evaluate the

integral $of$ the function $f(x,y)=x^3-2y^3$ over the rectangular

region $R=[1,2][2,4].$

$\%$ Problem $1$ Code Here

Problem $2$: Use MATLAB and the integral$2()$ function $to$ evaluate the

integral ${}_R(x+y)dA$ over the region

$R=\{(x,y){|}^2\sqrt[\phantom{2}]{x^2+y^2}4,y0\}.$

Put your mat$\frac{h}{e}$xplanation here...

$\%$ Problem $2$ Code Here

Problem $3$: Use MATLAB and the integral$3()$ function $to$ evaluate the

integral ${\displaystyle \underset{0}{\overset{2}{}}}{\displaystyle \underset{0}{\overset{2}{}}}{\displaystyle \underset{0}{\overset{\sqrt[\phantom{2}]{16-r^2}}{}}}{r}^{2}dzdrd.$ Use the trisurf$()$ function $to$

visualize the region $of$ integration over the rectangular region

$R=[-3,3][-3,3][0,4].$

Put your mat$\frac{h}{e}$xplanation here...

$\%$ Problem $3$ Code Here