In Exercises , formulate the linear or piecewise linear model for the real-life scenario....

In Exercises , formulate the linear or piecewise linear model for the real-life scenario. If a linear model represents a directly proportional Relationship between the independent and dependent variables, so state.

Cellular Phone Plan Sprint PCS offered a service plan to its Seattle-area customers for $29.99 per month that included 200 anytime minutes. The plan also included free long distance. Additional minutes or portions of a minute were $0.40 each. (Source: www 1 .sprintpcs.com.)

(a) Determine the cost equation for the Sprint PCS plan as a function of the number of anytime minutes used.

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(b) Is the Sprint plan or the Qwest plan (from Exercise 8) a better deal for a consumer who uses 300 anytime minutes monthly? Explain.