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What term best describes a line and a point that lie in the same plane? a. congruent b. coplanar c. collinear d. equal

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

What is the area of the shaded sector?