1. The problem statement, all variables and given/known data Given A(1,7) and B(8,3). C lies on OB where O is the origin. If vector OA + BA + CA is perpendicular to vector OB, find the coordinates of C. 2. Relevant equations 3. The attempt at a solution The answer i get is C=(112/73 , 42/73) but the answer given is (-71/2 , 195/7). What answer do you get?