3. 4. If u=[2,-5] and v=[k,4], and u is orthogonal (perpendicular) to v, then the value of k is: a) -10 b) -2.5 c) 10 d)2.5 Which point is not a solution to the equation 2x + 4y − z + 14 = 0? a)(0,0,14) b)(1,0,16) c)(1,1,20) d)(2,0,22)