1.	In mathematics, a ratio is a comparison of two numbers by ______.
		A.	division	B.	addition
		C.	multiplication	D.	subtraction
		Hint
	2.	Solve the proportion =
		A.	13.5	B.	6
		C.	20	D.	80
		Hint
	3.	Solve the proportion =
		A.		B.	-18
		C.		D.	4.5
		Hint
	4.	When a rate is simplified so it has denominator of 1, it is called a(n) ______.
		A.	unit rate	B.	proportional ratio
		C.	dimensional rate	D.	equivalent analysis
		Hint
	5.	Convert 18 L to mL.
		A.	18,000 mL	B.	0.018 mL
		C.	180 mL	D.	1.8 mL
		Hint