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 PlanIn 2002, Qwest offered a 150-minute cellular plan including free long distance and free roaming to its Seattle-area customers for $29.99 per month. Additional time cost $0.35 per minute or portion of a minute. (Source: Qwest customer monthly statement.)

(a) Write the cellular phone cost equation as a function of the number of minutes used.

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(b)How could you use the cost equation if you were enrolled in the plan?