If she works 40 hours or less then she earns 20x dollars. If she works more than 40 hours, then she earns 20×40 dollars for the first 40 hours and 30×(x-40) dollars for <span>every hour over 40 hours. The number of hours over 40 hours is x-40.</span>
<span>Potential Energy is any type of stored energy. It can be chemical, nuclear, gravitational, or mechanical.Kinetic ...GRAVITATIONAL.CHEMICAL.<span>NUCLEAR. even motion.</span></span>