$(10)7.$ Use double integration $in$ polar coordinates $to$ find the volume $of$ the solid that lies

below the surface $z=ln(x^2+y^2)$ and above the circles $x^2+y^2=1$ and $x^2+y^2=4$

$in$ the $xy-$ plane.

$(15)8.$ Set $up$ the following triple integrals $a\{$:${}_{Q}dxdydz,b){}_{Q}dydzdx,$ and

$c{}_{Q}dzdxdy$ where $Qis$ the tetrahedron cut from the first octant $by$ the

plane $x+y+z=5.$ Evaluate all three sets $of$ integrals.

$(12)9.$ Find the volume $of$ the solid bounded $by$ the graphs $of$ these equations: $z=9-x^2,$

$z=0,y=0,$ and $y=2x.$

$(14)10.$ Find the mass and $\stackrel{}{x}of$ the region $Q$ with density, $=3,$ where $Qis$ the solid region

bounded $by4x+4y+2z=8,x=0,y=0,$ and $z=0.$

$(12)11.$ Use cylindrical coordinates $to$ find the mass $of$ the ellipsoid $Q$ given $by4x^2+4y^2$

$+z^2=16$ lying above the $xy-$plane when its density $is=2......$ please solve ALL questions