1.	Determine whether the relation {(7, 2), (-10, 3), (-5, -1), (7, 3)} 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.	Yes, because every relation is a function.
		D.	No, because there is an element in the domain that is paired with two elements in the range.
		Hint
	2.	Determine whether the relation is a function. Explain.
		A.	Yes, because each element in the domain is paired with exactly one element in the range.
		B.	No, because there is an element in the domain that is paired with two elements in the range.
		C.	Yes, because every relation is a function.
		D.	No, because there are two elements in the domain that are paired with the same element in the range.
		Hint
	3.	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
	4.	Which relation is not a function?
		A.	{10, 0), (2, 4), (-2, 4)}
		B.	{(-2, 1), (2, 3), (6, 5)}
		C.	{(2, 4), (3, 5), (2, 7)}
		D.	{(1, 1), (2,2), (3, 3)}
		Hint
	5.	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