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Problem
If the cost of a 4-minute telephone call is $0.24, then the cost of a 15-minute call at the same rate is:

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acrimonious
Definition: (adjective) biting, harsh, caustic.
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Select the Chapter below that corresponds to your math book. Test yourself on hundreds of practice problems. Find step-by-step solutions if you get stuck.

•	Chapter 1: Relations and Functions
•	Chapter 2: Systems of Equations and Inequalities
•	Chapter 3: Polynomial and Rational Functions
•	Chapter 4: Exponential and Logarithmic Functions
•	Chapter 5: Trigonometric Functions
•	Chapter 6: Graphs of Trigonometric Functions
•	Chapter 7: Polar Coordinates and Complex Numbers
•	Chapter 8: Conic Sections
•	Chapter 9: Sequences and Series