1.	Find the greatest common factor of 168 and 288.
		A.	24	B.	36
		C.	2	D.	48
		Hint
	2.	What is the greatest common factor of 45, 75, and 135?
		A.	15	B.	5
		C.	25	D.	9
		Hint
	3.	What is the greatest common factor of 18mn2, 54m4, and 80n3?
		A.	18m2n3	B.	9mn
		C.	2mn2	D.	2
		Hint
	4.	Find the GCF of 17r4s4 and 23rs4.
		A.	rs4	B.	17rs4
		C.	r4s4	D.	rs
		Hint
	5.	Factor 15x3 - 5x2.
		A.	x2 (15x – 5)	B.	5x(3x2 - x)
		C.	5x2 (3x – 1)	D.	x(15x2 - 5x)
		Hint