I can do it on the casio classpad in sequence but what working out would you do?
I would usually say "after x amount of years the value of the car is y"
could be different
What I used to do was write up a line of the equation I used and the numbers I originally substituted with.
Then, I'd add a small table with two columns with what a few of the n (n= 1, 2, draw a few dots, [insert number before answer and answer]) and V
n values were.
Then, I'd write down one last line with the actual answer underneath that.
This was mostly for the Number Patterns module, which existed before the change in 2016, but should be similar in Financial Maths and Recursions.
Dec.Hargreaves might be right since my knowledge is outdated.