a)
The initial value of the car is $19,000, and after each year after 2012, the value decreases by $600.
So, the value V after t years will be 19000 minus t times 600, therefore the corresponding equation is:
b)
In 2018, we have 6 years after 2012, so t = 6.
Calculating the value of V for t = 6, we have:
Therefore the value of the car in 2018 is $15,400.