Sketch the graphs of the functions f and g and find the area of the region enclosed by these graphs and the vertical lines 
and 
. 
Definitions:
Variable Cost (VC)
The sum of the expenses of the firm that vary directly with the quantity of a product that is produced and sold.
Variable Cost
Costs that change in proportion to the level of production or sales activity, such as raw materials or labor expenses.
Total Cost
The sum of all expenses incurred in the production and delivery of a product or service, including fixed and variable costs.
Marginal Cost
The cost incurred by producing one additional unit of a product or service.
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