1.	Determine whether the graph is a function. Explain.
		A.	The graph does not provide enough information.	B.	No, the graph fails the vertical line test.
		C.	No, because there are two elements in the domain that are paired with the same element in the range.	D.	Yes, the graph passes the vertical line test.
		Hint
	2.	Select the relation that is a function.
		A.	{(-2, -1),(5, -1), (16, 3), (-3, -9)}
		B.	{(5, 10), (-3, 10), (-3, -10), (4, 7)}
		C.	{(-6, -5), (3, 2), (10, 8), (3, 3)}
		D.	{(21, 11), (21, 10), (21, 9), (21, 8)}
		Hint
	3.	Which of the following is (are) true about functions?
		A.	In a function, each member of the domain is paired with one and only one member of the range.	B.	Functions pass the vertical line test.
		C.	Functions are relations.	D.	All of these
		Hint
	4.	Functions can be expressed using which of these?
		A.	all of these	B.	ordered pairs
		C.	graphs	D.	tables
		Hint
	5.	Which graph is not a function?
		A.		B.
		C.		D.
		Hint