Essay
A phone service charges 3.1 cents per minute for the first 30 minutes and 6 cents per minute thereafter.
(a) Write this information in the form of a simplified piecewise-defined
function and state the effective domain for each piece.
(b) Sketch the graph.
(c) Find the cost of a 48-minute phone call.
Correct Answer:
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(a) 
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Correct Answer:
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(b) ...View Answer
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