To find: the equation to calculate monthly telephone charges and the cost for 42 calls.
Answer to Problem 27E
Cost for 42 calls = $15.42
Explanation of Solution
Given information:
Cost of call (excluding tax) = $13.65
Cost of call after 30 = Cost of 30 calls + $0.15 for each call after 30
Total calls to be made 42.
Calculation:
Let x be the number of calls and y be the cost of one call. The equation derived from the given data is as follows:
Put
Thus, the cost for 42 calls is $15.42.
Chapter 2 Solutions
Advanced Mathematical Concepts: Precalculus with Applications, Student Edition
Additional Math Textbook Solutions
University Calculus: Early Transcendentals (4th Edition)
Calculus: Early Transcendentals (2nd Edition)
University Calculus: Early Transcendentals (3rd Edition)
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Single Variable Calculus: Early Transcendentals (2nd Edition) - Standalone book
Calculus and Its Applications (11th Edition)
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