1.	Find the greatest common factor of 168 and 288.
		A.	36	B.	24
		C.	48	D.	2
		Hint
	2.	What is the greatest common factor of 18mn2, 54m4, and 80n3?
		A.	9mn	B.	2
		C.	2mn2	D.	18m2n3
		Hint
	3.	Find the GCF of 16a3b2 and 12a2b.
		A.	4ab	B.	2ab
		C.	4a2b	D.	2a2b
		Hint
	4.	Find the GCF of 17r4s4 and 23rs4.
		A.	17rs4	B.	rs
		C.	r4s4	D.	rs4
		Hint
	5.	Factor 7x + 21.
		A.	7x(1 + 21)	B.	7(x + 21)
		C.	x(7 + 21)	D.	7(x + 3)
		Hint