Use the following figure to answer the question : Figure 9-3 : shows the marginal cost curve,average total cost curve,average variable cost curve,and marginal revenue curve for a firm for different levels of output. 
-At the profit-maximizing level of output in Figure 9-3,the profit of the firm is equal to the area given by _____.
Definitions:
Adipose Tissue
A type of connective tissue that stores fat, providing insulation and energy reserves.
Connective Tissue
A type of body tissue that supports, binds together, and protects organs and other tissues, comprising cells, fibers, and a ground substance.
Oily Substance
A greasy or slick material, often derived from petroleum or plant sources, that does not mix with water.
Parasitic Lice
refer to tiny, wingless insects that live on the skin of humans or animals, feeding on blood and causing irritation.
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