1.	In mathematics, a ratio is a comparison of two numbers by ______.
		A.	multiplication	B.	subtraction
		C.	division	D.	addition
		Hint
	2.	An equation stating that two ratios are equal is called a(n) ______.
		A.	equivalent equation	B.	proportion
		C.	rate	D.	cross product
		Hint
	3.	Every proportion has two cross products which are always ______.
		A.	positive	B.	negative
		C.	zero	D.	equal
		Hint
	4.	Solve the proportion =
		A.		B.
		C.	-18	D.	4.5
		Hint
	5.	When a rate is simplified so it has denominator of 1, it is called a(n) ______.
		A.	dimensional rate	B.	proportional ratio
		C.	equivalent analysis	D.	unit rate
		Hint