Question 119899: Solve the problem. Parts for an automobile repair cost $448. The mechanic charges $28 per hour. If you receive an estimate for at least $532 and at most $616 for fixing the car, what is the time interval, in hours, that the mechanic will be working on the job?
a.{1,6}
b.{1,3}
c.{3,6}
Answer by ptaylor(2198)   (Show Source):
You can put this solution on YOUR website! Labor alone costs at least $532-$448=$84
Labor alone costs at most $616-$448=$168
The time interval (TI) can be stated as follows:
$84/$28<=TI<=$168/$28 or
3<=TI<=6
The answer is c.
Hope this helps---ptaylor
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