1.	Determine whether the relation is a function. Explain.
		A.	No, because there is an element in the domain that is paired with two elements in the range.
		B.	Yes, because every relation is a function.
		C.	No, because there are two elements in the domain that are paired with the same element in the range.
		D.	Yes, because each element in the domain is paired with exactly one element in the range.
		Hint
	2.	Which relation is not a function?
		A.	{(1, 1), (2,2), (3, 3)}
		B.	{10, 0), (2, 4), (-2, 4)}
		C.	{(-2, 1), (2, 3), (6, 5)}
		D.	{(2, 4), (3, 5), (2, 7)}
		Hint
	3.	Which of the following is (are) true about functions?
		A.	Functions pass the vertical line test.	B.	Functions are relations.
		C.	All of these	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.	tables	B.	graphs
		C.	all of these	D.	ordered pairs
		Hint
	5.	Which graph is not a function?
		A.		B.
		C.		D.
		Hint