The option is a cost function of time.
We have given that,
At a car repair shop, the cost of a repair depends on the time the mechanic works.
We have to determine the, The following shows this idea expressed in function notation.
What is the cost?
In production, research, retail, and accounting, a cost is the value of money that has been used up to produce something or deliver a service and hence is not available for use anymore.
Therefore, the option is a cost function of time.
Therefore option D is correct.
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