I really don't fully understand Stoke's Theorem and am struggling with these problems. Can someone please help me?

Let F =. Use Stokes' Theorem to evaluate curlF . dS, where S S is the part of the paraboloid z = 8 - x2 - y that lies above the plane z = -8, oriented upwardsLet F =. Use Stokes' Theorem to evaluate curlF . dS, where S S is the hemisphere a + y + 2" = 4, 2 2 0, oriented upwards.Use Stokes' Theorem to evaluate the line integral 6ydx + -5zdy + 4xdz where C is the intersection of the xy -plane and hemisphere z = V1 - x2 - y traversed counterclockwise viewed from the top- that is, from the positive z -axis toward the xy-plane