Answer:
A and C have inverses.
Explanation:
A matrix has an inverse if the matrix is a square matrix whose determinant is not equal to zero.
|A| = 3(3) - 6(1) = 9 - 6 = 3
B is not a square matrix.
|C| = 7(1) - 0(0) = 7 - 0 = 7
D is not a square matrix.
|E| = 4(1) - 4(1) = 4 - 4 = 0, so E does not have an inverse.
|F| = 3(8) - 4(6) = 24 - 24 = 0, so F does not have an inverse.