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Find an equation of the tangent to the curve at the point corresponding to the given value of the parameter.
Real Cost
The total economic cost of production, considering all direct and indirect resources consumed, including opportunity costs.
Commodity Resources
Basic goods used in commerce that are interchangeable with other goods of the same type.
Fracking
A method of oil and gas extraction that involves injecting liquid at high pressure into subterranean rocks, boreholes, etc., to force open existing fissures and extract oil or gas.
U.S. Oil Supply
The total quantity of oil available for use or consumption in the United States, coming from domestic production and imports.
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