Question

A new car worth $20,000 is depreciating in value by $4,000 per year. After how many years will the car's value be $8,000?

Answer 1

3 years

Explanation:

`20000 - 4000x = 8000 \\ 20000=8000 + 4000x \\ 20000 - 8000 = 4000x \\ 12000 = 4000x \\ (12000)/(4000) = x \\ x = 3`