The value V of a certain automobile that is t years old can be modeled by V(t) = 14,631(0.78)$^t$. According to the model, when will the car be worth each of the following amounts?
(a) $7000
(b) $6000
(c) $1000
(a) The car will be worth $7000 after \boxed{} years.
(Type an integer or a decimal rounded to the nearest tenth as needed.)