Differentiate: f(x)= 
Definitions:
Gross Earnings
The total income earned by an individual or company before any deductions or taxes are taken out.
Provincial Utility
A utility company or service, like electricity or water, that is operated at the provincial or state level rather than locally or nationally.
Biweekly
Occurring every two weeks.
Overtime
Additional time worked beyond the standard working hours, often compensated at a higher rate.
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