Multiple Integrals

 $\int_0^2\int_0^2dxdy$   is ___________

 $\int_0^{\pi/2}\int_0^1\cos ydxdy$  

  is ___________

The curve $x^2=8y$   represents___________

The Curve $\frac{x^2}{4}+\frac{y^2}{9}=1$ represents

The Curve $x^2+y^2=9$ represents

In  $\int_0^2\int_0^{x^{ }}f(x,y)dydx$ , the limit of y varies from ___________

In $\int_0^1\int_0^{1-z}\int_0^{1-y-z}xyzdxdydz$ the limit of x varies from____________

 $\int_0^{\frac{\pi}{2}}\int_0^1rdrd\theta$  is ___________

 $\int_0^3\int_0^3\int_0^3dxdydz$  is________