Please help ASAP! My homework is due and i'm super confused.

Evaluate the surface integral f(x.y.z) dS using a parametric description of the surface. S 2 f( x. V.z) = x +v. where S is the hemisphere x + v +z"=4. for z =0) 2 Write a parametric description of the given hemisphere using u = ( and v = 0 r(u,v) = where 0 sus and SVs (Type exact answers.)