1.	Which graph represents a function?
		A.		B.
		C.		D.
		Hint
	2.	Consider a function machine that gives the positive square root of the input. If the input is , what is the output?
		A.		B.
		C.		D.
		Hint
	3.	Find the domain of the function.
		A.	all real numbers except –1
		B.	all real numbers except 1
		C.	all real numbers
		D.	all real numbers except 0
		Hint
	4.	Find the domain of the function.y = –x + 3
		A.	all real numbers	B.	all real numbers except 3
		C.	all real numbers except –3	D.	all real numbers except 1
		Hint
	5.	Hector needs to build a rectangular pen for his dog. He decides to use an area of 50 m2 in his backyard for the pen. Using w for the width, find a function f(w) that represents the perimeter of the fence in terms of w.
		A.	l + w = 50	B.	l = 50 – w
		C.		D.	lw = 50
		Hint