Which is not a characteristic of the absolute value parent function

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.

Prove that quadrilateral is a rhombus.

State one method by which you can recognize a perfect square trinomial.