Please answer these 2 questions for me! Take your time. These are my last points because no one answers my questions :( I need help with my math while I'm doing my other stuff.

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.

A50% increase followed by 33 1/2% decrease

In an improper fraction, is the numerator equal to, less than, or greater than the denominator