Find the derivative of the function. 
Definitions:
Natural Gas
A fossil fuel consisting mainly of methane, used primarily for heating, cooking, and electricity generation.
Heating Oil
A low viscosity, liquid petroleum product used as a fuel for furnaces or boilers in buildings.
Demand Curve
A graph depicting the relationship between the price of a good and the quantity demanded by consumers.
Quantity Demanded
The complete quantity of a product or service that buyers are ready and capable of buying at a certain price during a designated time frame.
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