Find an equation of the parabola whose graph is shown. 
Definitions:
Average Total Cost
The cost of producing each unit, calculated by dividing the overall production cost by the quantity of units made.
Marginal Cost
The extra expense that arises when one more unit of a product or service is produced.
Diminishing Returns
A principle in economics where each additional unit of input yields less and less extra output.
Average Variable Cost
The total variable cost divided by the number of units produced, representing the variable cost per unit of output.
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