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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.

Find the solution(s) to x^2-14+49=0

David leaves his house to go to school. he walks 200 meters west and 300 meters north. how far is david from his original starting point?