11.4.11 Find a unit vector perpendicular to the plane PQR where P(2, -2,1), Q (3, -1,2), and R(3, -1,1 ). 11.4.12 Parallel and perpendicular vectors.
11.4.11 Find a unit vector perpendicular to the plane PQR where P(2, -2,1), Q (3, -1,2), and R(3, -1,1 ). 11.4.12 Parallel and perpendicular vectors. Let u = 51 - j + k, v = j - 5k, and w = -151 + 3j - 3k. Which vectors, if any, are parallel? Which vectors, if any, are perpendicular? Give reasons for your answers
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