Owners of a recreation area are filling a small pond with water. They are adding water at a rate of 31 liters per minute. There are
500 liters in the pond to start.
Let W represent the total amount of water in the pond (in liters), and let T represent the total number of minutes that water has
been added. Write an equation relating W to T. Then use this equation to find the total amount of water after 13 minutes.