Evaluate the surface integral s 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. F(x, y, z) = yi − xj + 4zk, s is the hemisphere x2 + y2 + z2 = 4, z ≥ 0, oriented downward.

Based on calculations, students should have 10.4 grams of powder after conducting an experiment. the students get these results: 10.2 grams, 10.4 grams, 10.3 grams, 10.4 grams, and 10.5 grams. which words best describe this data? check all that apply. a- accurate b- falsified c-invalid d-precise e-redundant