You want to choose one long-distance telephone company from the following options
Chapter 1, Problem 59(choose chapter or problem)
You want to choose one long-distance telephone company from the following options. Company A charges $0.37 per minute. Company B charges $13.95 per month plus $0.22 per minute. Company C charges a fixed rate of $50 per month. Let YA, YB, YC represent the monthly charges using Company A, B, and C, respectively. Let x be the number of minutes per month spent on long-distance calls. (a) Find formulas for YA, YB, YC as functions of x. (b) Figure 1.70 gives the graphs of the functions in part (a). Which function corresponds to which graph? (c) Find the x-values for which Company B is cheapest.
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