How to solve

The solid inside the elliptic cone $(\frac{x}{a}{)}^2+(\frac{y}{b}{)}^2=(\frac{z}{h}{)}^2,0zh.$ If the density is $z,$

$($a$)$ find the mass of the solid.

$($b$)$ find the center of mass of the solid.

$($c$)$ find the moment of the inertia about z axis.