1.	Determine which matrix is the 3 × 3 identity matrix.
		A.		B.
		C.		D.
		Hint
	2.	Does the inverse of exist? If it does not exist, explain why not.
		A.	Yes
		B.	No; the determinant equals 0.
		C.	No; the matrix is not square.
		D.	No; the elements of the principal diagonal are not 1.
		Hint
	3.	If , find I so that
		A.		B.
		C.		D.
		Hint
	4.	Determine whether the pair of matrices are inverses.
		A.	yes, because A · B = I
		B.	yes, because each entry in the second matrix is the reciprocal of its corresponding entry in the first matrix
		C.	no, because A · B I
		D.	no, because fractions cannot be a part of an inverse
		Hint
	5.	Find the inverse of if it exists.
		A.		B.	does not exist, since ad – bc = 0
		C.		D.
		Hint