How much will money will u pay if a pair of 100 headphones have a 15% percent discount

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.

Which ordered pair is a solution to the system of linear equations? 2x + 3y= 6 –3x + 5y = 10

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28