A water tank initially contains 500 gallons of water. Water is drained from the tank at a constant rate. The equation represents the amount of water remaining in the tank, in gallons, after minutes. Which of the following is the best interpretation of the number -25 in this context?
The amount of water, in gallons, remaining after 25 minutes
The initial amount of water in the tank, in gallons
The rate at which water is drained from the tank, in gallons per minute
The total amount of water drained from the tank
