Exam 8: Rational Expressions
Exam 1: Real Numbers and Variable Expressions181 Questions
Exam 2: First-Degree Equations and Inequalities141 Questions
Exam 3: Geometry79 Questions
Exam 4: Linear Functions and Inequalities in Two Variables92 Questions
Exam 5: Systems of Linear Equations and Inequalities36 Questions
Exam 6: Polynomials104 Questions
Exam 7: Factoring112 Questions
Exam 8: Rational Expressions111 Questions
Exam 9: Exponents and Radicals94 Questions
Exam 10: Quadratic Equations76 Questions
Exam 11: Functions and Relations62 Questions
Exam 12: Exponential and Logarithmic Functions71 Questions
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Write the fractions below in terms of the LCM of the denominators. 

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Correct Answer:
C
A new machine can make 12,500 aluminum cans four times faster than an older machine. With both machines working, 12,500 cans be made in 20 h. How long would it take the new machine, working alone, to make 12,500 cans?
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The repulsive force (f) between the north poles of two magnets is inversely proportional to the square of the distance (d) between them. If the repulsive force is 10 lb when the distance is 16 in., find the repulsive force when the distance is 8 in.
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In a city of 30,000 homes, a survey was taken to determine the number with cable television. Of the 300 homes surveyed, 206 had cable television. Estimate the number of homes in the city that have cable television.
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A cruise ship can sail at 27 mph in calm water. Sailing with the gulf current, the ship can sail 136 mi in the same amount of time it can sail 80 mi against the gulf current. Find the rate of the gulf current.
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The distance (d) that a spring will stretch varies directly as the force (f) applied to the spring. If a force of 4 lb is required to stretch a spring 2 in., what force is required to stretch the spring 6 in.?
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Two pipelines can fill a small tank in 10 min. One of the pipelines would require 20 min to fill the tank. How long would it take the second pipeline, working alone, to fill the tank?
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Write each of the following fractions in terms of the LCM of the denominators: 

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On a map, two cities are
in. apart. If 3/8 in. on the map represents 25 mi, find the number of miles between the two cities. 


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An express train travels 464 mi in the same amount of time it takes a freight train to travel 240 mi. The rate of the express train is 28 mph faster than that of the freight train. Find the rate of the express train.
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