I need Help im d. u.m. b

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.

To determine the number of deer in a forest a forest ranger tags 280 and releases them back

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2