The coordinates of the vertices of quadrilateral abcd are a(-,5 -1), b(-1,-1),c(-1,4), and D(-5,6).

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.

Which is a graph of a proportional relationship?

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