Here's the question you clicked on:
ma7eer1992
Find the flux of F through the surface S. F== 3xi + xzj + z^2k, and S is the boundary of the solid bounded by z = 4-x^2-y^2 and z = 0.
That will be the surface integral of F. You'll have to parameterize your surface, then calculate the integral of F(parameterized)(scalar product)(Dot product of the partial derivatives of your parameterization)
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Or use Gauss theorem xD