SOLUTION: a plumber charges 75 dollars for service call and 40 dollars per hour for time spent. what is the rate of change?

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Question 1058372: a plumber charges 75 dollars for service call and 40 dollars per hour for time spent. what is the rate of change?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Rate of change of what exactly?
Please repost.