Communications The cost of a telephone call between Denver and Boise is $0.60 for the
Chapter 1, Problem 61(choose chapter or problem)
Communications The cost of a telephone call between Denver and Boise is $0.60 for the first minute and $0.42 for each additional minute or portion of a minute. A model for the total cost (in dollars) of the phone call is where is the length of the phone call in minutes. (a) Sketch the graph of the model. (b) Determine the cost of a call lasting 12 minutes and 30 seconds.
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