Unless otherwise specified assume that all matrices in these exercises are n  n Determine which of the matrices in Exercises1–10 are invertible Use as few calculations as possible Justify your answer

To determine if this matrix is invertible, we can calculate its determinant:

5(-6) - 7(-3) = -30 + 21 = -9

Since the determinant is nonzero (-9 ≠ 0), the matrix is invertible.