Previous Problem Problem List Next Problem x (2 points) Among all unit vectors L7 = y in R3, find the one for which the sum x + 9y + 6z is minimal. 2 :1 || (2 points) Find a unit vector with positive first coordinate that is orthogonal to the plane through the points P = (3, 0, 1), Q = (8, 5, 6), and R = (8, 5, 10). ( 20 , 20 , 0 )