Given a circle with a diameter of 4, which equation expresses pi as the ratio of the circumference of a circle to its diameter

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.

What term makes it inconsistent y=2x - 4 ?

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68