Please answer each of these questions to the best of your ability. You are welcome to re-watch parts of any of the videos to help you.

Let represent the rate at which water drains from a tank (in gallons per minute)
and let represent the number of minutes elapsed since water started draining from
the tank. Which of the following best describes the meaning of ?

The change in the
rate at which the water drains from 1 to 4 hours after starting to drain the water. The change in the volume of water in the tank from 1 to 4 hours after starting
to drain the tank. The average rate at which water is leaving the tank
from 1 to 4 hours after starting to drain the tank. The amount of water
that has drained from the tank 4 hours after starting to drain the tank.