Can some moderators comment on this?? i wanna view their profile

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 is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Solve the following inequalities and show the solution on a number line. 3/4 (2x-7) ≤ 5