Question

I am given vector field V : in Cartesian coordinate system. 1) what is the flux through part of surface z=4-x^2-y^2 above plane 0XY to that side of the above surface, where it's normal makes narrow angle with the Z axis? 2) flux through the whole surface consisting from z=4-x^2-y^ and 0XY plane. 3) circulation along 0=4-x^2-y^2 ANY HELP APPRECIATED!