1.	Select the relation that is a function.
		A.	{(-2, -1),(5, -1), (16, 3), (-3, -9)}
		B.	{(-6, -5), (3, 2), (10, 8), (3, 3)}
		C.	{(21, 11), (21, 10), (21, 9), (21, 8)}
		D.	{(5, 10), (-3, 10), (-3, -10), (4, 7)}
		Hint
	2.	Select the relation that is a function.
		A.
		B.
		C.
		D.
		Hint
	3.	Which of the following is (are) true about functions?
		A.	All of these	B.	Functions are relations.
		C.	Functions pass the vertical line test.	D.	In a function, each member of the domain is paired with one and only one member of the range.
		Hint
	4.	Functions can be expressed using which of these?
		A.	all of these	B.	tables
		C.	ordered pairs	D.	graphs
		Hint
	5.	Which graph is not a function?
		A.		B.
		C.		D.
		Hint