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.	In order for a matrix to have an inverse, what must be true?
		A.	ad – bc = 1	B.	ad – bc 0
		C.	ad – bc 1	D.	ad – bc = 0
		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