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