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A plumber charges $80 for a service call plus $30 per hour. a. Find a linear function that represents the total daily charges C, in
A plumber charges $80 for a service call plus $30 per hour.
a. Find a linear function that represents the total daily charges C, in dollars, as a function of the time t, in hours, spent at a given location.
b. If the total charge was $140, how many hours did he work?
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