1. Suppose that the monthly cost of a long-distance phone plan is a linear function of the total calling time (in minutes). When graphed, the function gives a line with a slope of 0.11. See the figure below. The monthly cost for 30 minutes of calls is $17.33. What is the monthly cost for 33 minutes of calls? Monthly cost 17.33 (in dollars) 30 Calling time (in minutes)
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We know that the cost function is linear, so it can be represented as C(x) = mx + b, where C(x) is the monthly cost, x is the calling time in minutes, m is the slope, and b is the y-intercept. Show more…
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