= AB has a midpoint at (4, 6). If A has coordinates of (0, 4), find the coordinates of B. (5,2) {8,8} (2,5)

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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.