E Try Again
Suppose that the monthly cost of a long-distance phone plan (in dollars) is a linear function of the total calling time in minutes)
When graphed, the function gives a line with a slope of 0.09. See the figure below.
The monthly cost for 39 minutes of calls is $12.34. What is the monthly cost for 30 minutes of calls?
1234
Monthly cost
(in dollars)
Calling time
(in minutes)
Explanation
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