A water tank initially contains liters of water. Water is drained from the tank at a constant rate. The equation models the amount of water , in liters, remaining in the tank after minutes. Which of the following does represent in the equation?
The initial amount of water in the tank.
The total time it takes to drain the tank.
The rate at which water is drained from the tank in liters per minute.
The amount of water remaining after 1 minute.
