Eliminate the parameter to find a Cartesian equation of the curve. 
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A digital file, such as music or a movie, purchased and downloaded from Apple's iTunes platform.
Marginal Benefit
The increase in satisfaction or usefulness gained from the consumption of an additional unit of a good or service.
Marginal Cost
The expense associated with manufacturing an extra unit of a product or service.
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Outdoor lighting installed along streets and in public areas to provide illumination during the night for visibility and safety.
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