1.	Simplify the expression .
		A.	17	B.	19
		C.	21	D.	61
		Hint
	2.	Simplify .
		A.		B.
		C.		D.
		Hint
	3.	To determine the speed of a vehicle involved in an accident, police officers use the formula . In the formula, s is the speed in miles per hour, d is the length of the skid marks in feet, and f is the friction factor. Suppose for a particular accident d = 45 feet and f = 0.8. What was the approximate speed of the vehicle?
		A.	84 miles per hour	B.	198 miles per hour
		C.	33 miles per hour	D.	14 miles per hour
		Hint
	4.	Simplify the expression .
		A.	8	B.	12
		C.	14	D.	20
		Hint
	5.	Simplify .
		A.		B.
		C.		D.
		Hint