1.	Find the greatest common factor of 168 and 288.
		A.	2	B.	48
		C.	24	D.	36
		Hint
	2.	Find the GCF of 16a3b2 and 12a2b.
		A.	4ab	B.	4a2b
		C.	2a2b	D.	2ab
		Hint
	3.	Find the GCF of 17r4s4 and 23rs4.
		A.	17rs4	B.	r4s4
		C.	rs	D.	rs4
		Hint
	4.	Factor 7x + 21.
		A.	7x(1 + 21)	B.	x(7 + 21)
		C.	7(x + 3)	D.	7(x + 21)
		Hint
	5.	Factor 15x3 - 5x2.
		A.	5x(3x2 - x)	B.	x(15x2 - 5x)
		C.	5x2 (3x – 1)	D.	x2 (15x – 5)
		Hint