Water flow: Water is flowing into a tank at a steady rate of 2 gallons per minute. Let t be the time, in minutes, since the process began, and let V be the volume, in gallons, of water in the tank. ...

Water flow: Water is flowing into a tank at a steady rate of 2 gallons per minute. Let t be the time, in minutes, since the process began, and let V be the volume, in gallons, of water in the tank.

a. Explain why V is a linear function oft, and write an equation of change for V.

b. If initially there were 4 gallons of water in the tank, find a formula for V.

c. The tank can hold 20 gallons. How long will it take to fill the tank?