If possible, use the given matrices A and B to find the following (a) A+ B, (b) 4A, (c) 4A-3B 3 -40 5 70 A- 2 45 -805 5 0 3 (a) Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice. âA, A+B= Simplify your answers) B. A+8-1 L (Simplify your answers.) O C. A+B is undefined (b) Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice Simplify your answers.) Click to select and enter your answer(s O Type here to search