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
		B.	all real numbers except –1
		C.	all real numbers except 1
		D.	all real numbers except 0
		Hint
	4.	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 l for the length and w for the width, express the area in terms of the two variables.
		A.		B.	w = 50 – w
		C.	l + w = 50	D.	lw = 50
		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.		B.	l = 50 – w
		C.	l + w = 50	D.	lw = 50
		Hint