Answer: $8470
Step-by-step explanation:
To solve this, you can substitute 4 for x:
[tex]f(x) = 13500*.89^4\\f(x) = 13500*0.6274\\f(x) = 8470[/tex]
Mikayla's scooter is worth around $8470 after 4 years.
It was originally worth 13,500 dollars and depreciated by 11% every year.
