Nathan wants to draw a triangle. he knows that two of the side lengths are 5 inches and 9 inches. which of the following are possible lengths for the third side. ( you can chose multiple answers )

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 can you determine about the solutions of this system

Math it's appreciated. (picture provided)