1.	The set of whole numbers and their opposites are known as ______.
		A.	negative numbers	B.	positive numbers
		C.	absolute values	D.	integers
		Hint
	2.	Simplify |-13| - |5|.
		A.	18	B.	8
		C.	-18	D.	-8
		Hint
	3.	Evaluate the expression |a| - 7 if a = -23.
		A.	-30	B.	16
		C.	30	D.	-16
		Hint
	4.	Evaluate the expression 2|x| - 3|y| if x = -8 and y = -5.
		A.	31	B.	-31
		C.	-1	D.	1
		Hint
	5.	Which symbol makes the expression -15 ___ -14 true?
		A.	×	B.	=
		C.	<	D.	>
		Hint