Owners of a recreation area are filling a small pond with water. They are adding water at a rate of 28 liters per minute. There are 300 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.