What is the value of x in the equation below?

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.

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?

Acd that is originally priced at $15.85 red-tagged for the sale. what is the sale price of the cd