Evaluate the surface integral F dS for the given vector field F and the oriented surface S. In other words, find the flux of F across S. For closed surfaces, use the positive (outward) orientation. S F(x, y, z) = yi-xj + 4zk, S is the hemisphere x2 + y2 +z² = 4, z≥ 0, oriented downward x Need Help? Read It

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