1.	Determine which matrix is the 3 × 3 identity matrix.
		A.		B.
		C.		D.
		Hint
	2.	Find the inverse of
		A.		B.
		C.		D.
		Hint
	3.	Determine whether the pair of matrices are inverses.
		A.	no, because fractions cannot be a part of an inverse
		B.	yes, because A · B = I
		C.	no, because A · B I
		D.	yes, because each entry in the second matrix is the reciprocal of its corresponding entry in the first matrix
		Hint
	4.	What is the 4 × 4 identity matrix?
		A.		B.
		C.		D.
		Hint
	5.	Find the inverse of if it exists.
		A.		B.	does not exist, since ad – bc = 0
		C.		D.
		Hint