How do I write a formula that expresses delta y in terms of delta x if the equation is y=1.1x+4.04 and the points are (-1.4,2.5) and (3.1,7.45)?

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.

Shannon drove for 540 minutes. if she traveled 65 miles per hour,how many total miles did she travel?

An 18% discount on a watch saved a shopper $72. find the price of the watch before the discount