Hello, can someone please provide any help to the following problem for an exam on Saturday.

Use polar coordinates to find the volume of the given solid:

a) Below the parabloid z = 18 – 2x^2 – 2y^2 and above the xy-plane

b) Enclosed by the hyperboloid – x^2 – y^2 + z^2 = 1 and the plane z = 2

Any help will be appreciated. Thank you.