A family of functions is given and the graph of some members of the family are shown. Write the indefinite integral that gives the family. 
Definitions:
Marginal Revenue Curve
A graphical representation showing how additional revenue changes with an increase in the quantity of goods or services sold.
Purely Competitive
A market structure characterized by many buyers and sellers, homogeneous products, and no barriers to entry or exit, leading to optimal prices for consumers.
Demand Curve
A visual depiction representing the correlation between an item's price and the desired quantity by buyers.
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