What two numbers multiplyto 15 and add to 13

Volume of cylinder with a radius of 8cm and height of 25 cm

At the many chips cookie company they are serious about the number of chocolate chips in their cookies they claim that each cookie hasn't c chips. if their claim is true there will be 200 chips in 10 cookies

What is the average rate of change for this function for the interval from x=2 to x=4 ?