Find the flux of the vector field F = (0,0,2) across the slanted face of the tetrahedron z = 4 - x - y in the first octant. Normal vectors point upward. . . . Set up the integral that gives the flux as a double integral over a region R in the xy-plane. JJ F. nas = ]]() dA S R (Type an exact answer.)Find the flux of the vector field F =