Question 174984
The Premium Plan has a monthly charge of $45 with 300 free minutes and $0.25 per minute for minutes in excess of 300 minutes. 
What are the equations, including the domain restrictions, which describe P(t), the Premium Plan?
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P(t) = 45 + (t-300)0.25
Domain 300 < t < inf.
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Cheers,
Stan H.