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