1.	The set of whole numbers and their opposites are known as ______.
		A.	positive numbers	B.	absolute values
		C.	negative numbers	D.	integers
		Hint
	2.	How can you represent writing a check for $10 as an integer?
		A.	|-10|	B.	|+10|
		C.	-10	D.	+10
		Hint
	3.	Simplify |-13| - |5|.
		A.	18	B.	-18
		C.	-8	D.	8
		Hint
	4.	Evaluate the expression |a| - 7 if a = -23.
		A.	16	B.	30
		C.	-16	D.	-30
		Hint
	5.	Evaluate the expression 2|x| - 3|y| if x = -8 and y = -5.
		A.	-31	B.	1
		C.	-1	D.	31
		Hint