1.	Determine which matrix is the 3 × 3 identity matrix.
		A.		B.
		C.		D.
		Hint
	2.	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
	3.	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
	4.	What is the 4 × 4 identity matrix?
		A.		B.
		C.		D.
		Hint
	5.	Find the inverse of if it exists.
		A.	does not exist, since ad – bc = 0	B.
		C.		D.
		Hint