53	Chapter P▪Prerequisites:  Fundamental Concepts of Algebra

In Exercises 103-112, simplify using propertíes of exponents.
103.	

107.	
109.	

111.	
In Exercises 113-120, simplify by reducing the index ofthe radical.
113.	
115.	
117.	

~ Practice Plus
.-- ~ In Exercises 121-123, evaluate each expression.
121.	

123.	
124.	Solve:

In Exercises 125-128, simplify each expression.Assume that al! variables represent positive numbers.

125.	
127.	

models the distance, d, in miles, that a person h feet high can see
the horizon. Use this formula to solve Exercises 129-130.	.
.1
129. The pool deck on a cruise ship is 72 feet above the wat'
How far can passengers on the pool deck see? Write t/¡j answer in simplified radical formo Then use the simplifié radical form and a calculator to express the answer to t~ nearest tenth of a mile.
130. The captain of a cruise ship is on the star deck, which is 121 feet above the water. How far can the captain see? Wri~ the answer in simplified radical formo Then use the simpij fied radical form and a calculator to express the answer t:
	the nearest tenth of a mile.
Police use the formula v = 2 V5i to estímate the speed of a car, v,i
in miles per hour, based on the length, L, in feet, of its skid marb upon sudden braking on a dry asphalt road. Use the formula to solve Exercises 131-132.
131. A motorist is involved in an accident. A police officer mea
sures the car's skid marks to be 245 feet long. Estimate th"
speed at which the motorist was traveling before braking. ij' the posted speed limit is 50 miles per hour and the motoris'
tells the officer he was not speeding, should the office~
believe him? Explain.
132. A motorist is involved in an accident. A police officer mea~ sures the car's skid marks to be 45 feet long. Estimate th
speed at which the motorist was traveling before braking. If'i the posted speed limit is 35 miles per hour and the motoris~ tells the officer she was not speeding, should the officer
	believe her? Explain.	.
133. In the Peanuts cartoon shown below, Woodstock appears to
	be working steps mentally. Fill in the missing steps that show
	7~ 7. r,;
	how to go fram	f	to "3 v 3.