Add or subtract the given polynomials. 
Definitions:
Marginal Cost
The raised expense resulting from the production of one additional product or service unit.
Optimal Amount
The most efficient level or quantity of a good or service to achieve a specific goal or maximize utility.
Concentration Ratios
Measures that indicate the degree of market concentration by showing the market share of the largest firms in an industry.
Inverted-U Theory
A hypothesis that suggests there is a relationship between the level of some activity and the effect it has on performance, which looks like an inverted U, indicating optimal performance at an intermediate level of the activity.
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