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.	No; the matrix is not square.
		B.	No; the determinant equals 0.
		C.	Yes
		D.	No; the elements of the principal diagonal are not 1.
		Hint
	3.	If , find I so that
		A.		B.
		C.		D.
		Hint
	4.	What is the 4 × 4 identity matrix?
		A.		B.
		C.		D.
		Hint
	5.	Find the inverse of if it exists.
		A.		B.
		C.	does not exist, since ad – bc = 0	D.
		Hint