Given: p and q are different points.
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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.

Can someone me do math because i am having a breakdown rn because i don’t get it

What is the value of p in the equation y^ = -4x?