please help me

1. Use the Divergence Theorem to evaluate the flux of the field F(x, y, z) = (7x2 - z2, er - cos x, 7y') through the surface S, where S is the boundary of the region bounded by x + 2y + 4z = 12 and the coordinate planes in the first octant. 2. Use the Divergence Theorem to evaluate the flux of the field F(x, y, z) = (x + z, xz + y, zx - y) through S, where S is a surface that bounds a solid region with the boundary given by the parabolic cylinder z = 1 - x2 and the planes z = 0, y = 0, and z + y = 8. 3. For the vector field F = (2x, 0, 0), calculate the total flux through the region x2 + y