All these values will assume you are rounding to the nearest tenth
This is what the equation is going to look like

So when we plug in the values

From here you will need to follow PEMDAS

Keep following going through with the equation

Solve

Because this is a word problem you have to write it in a written explanation
so
If the car constantly decreases at a rate of 8% over a time period of 6 years, at the end of the time period the car will be worth $4680