u = [9, t] v = [-16, t] 15. Determine a value if t so that and are perpendicular. [3 marks] T 16. Determine if the vectors d = [5,1,-2], b = [2, 3, 1]and & = [11,9, 4] are coplanar [6 marks] 17. Find the x, y and z intercept of the following plane 4x-8z=16 [2 marks]