A tank initially contains 7 gallons of water. A faucet is opened and water begins pouring into the tank at a rate of 1.5 gallons per minute untill the tank is full. Which of the following represents the volume v of water , in gallons, in the tank as a function of time t , in minutes, that has elapsed since the faucet was opened?

A) V(t) = 1.5+ t

B) V(t) = 8.5+ t

C) V(t) = 1.5t

D) V(t) = 1.5t -7

E) V(t) = 1.5t +7

See a previously posted solution for that one here.