What is the next step

Ineed with math stuff it involves graphs

Find the volume of the solid bounded by the plane z=0 and the paraboloid z=1-x^2 –y^2

Can you me with this question? i'll reward *30 points i just need with this one question so that i could solve the others. * edit: i originally set up the question to reward 30 points, but for some reason i can only reward 15. if you don't get 30, then i'm sorry. i'm still kind of new to this site