Phone service charges: When it comes to phone service, a large number of calling plans are available. Under one plan, the first 30 min of any phone call costs only 3.3¢ per minute. The charge increases to 7¢ per minute thereafter. (a) Write this information in the form of a piecewise-defined function. Include the domain for each piece. Then (b) sketch the graph and find the cost of a 46-min phone call.
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