Communications The cost of using a telephone calling card
Chapter 1, Problem 1.3.87(choose chapter or problem)
Communications The cost of using a telephone calling card is $1.05 for the first minute and $0.38 for each additional minute or portion of a minute. (a) A customer needs a model for the cost of using the calling card for a call lasting minutes. Which of the following is the appropriate model? (b) Use a graphing utility to graph the appropriate model. Use the value feature or the zoom and trace features to estimate the cost of a call lasting 18 minutes and 45 seconds
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