help me with 7 - 9 please

7. Find the following matrix product, if it exists. -7 9 -4 3 -2 8 0 2 1 0 7 3 1 -6 2 Select the correct choice below and, if necessary, ll in the answer box to complete your choice. - 7 9 - 4 3 - 2 O A. 8 0 2 1 0 = (Simplify your answer.) 7 3 1 -6 2 O B. The product does not exist. 8. Determine whether the given matrices are inverses of each other by computing their product. 5 2 1 2 A = Y B = 2 - 1 2 - 4 Select the correct choice below and ll in the answer box to complete your choice. (Type an integer or simplied fraction for each matrix element.) 0 A. The given matrices are inverses of each other because their product is the matrix Q B. The given matrices are not inverses of each other because their product is the matrix 9. Find the inverse, if it exists, for the given matrix. 4 2 2 6 Find the inverse. Select the correct choice below and, if necessaw, ll in the answer box to complete your choice. 0 A, The inverse is . (Type a matrix, using an integer or simplied fraction for each matrix element. Do not factor out a scalar multiple.) 0 B. There is no inverse of the given matrix