ChitChat charges $0.45 a minute for cellular phone calls. The cost per minute does not cha...

ChitChat charges $0.45 a minute for cellular phone calls. The cost per minute does not change, but the total cost changes as the telephone is used.

a. When the number of minutes is 6, what do the values of the corresponding point on each graph represent?

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b. What kind of assumption about the charges needs to be made to allow the connection of the points on each graph? Explain.

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c. If the time in minutes is t and the cost in dollars for calls is c, write c as a function of t for each graph.