I am really stuck on creating a formula for this exponential

[Phoenix29]

The first one is:

The area covered by a marsh,

, starts at

acres and drops by a

each year for

years. Write a formula for

.

I've tried 17000(1/3)^n and multiple variations of it to no avail. Could really use some help setting up the equation.

 

[stapel]

The area covered by a marsh, \(\displaystyle A\), starts at \(\displaystyle 17,000\) acres and drops by \(\displaystyle \frac{1}{3}\) each year for \(\displaystyle n\) years. Write a formula for \(\displaystyle A\, =\, f(n)\).

I've tried 17000(1/3)^n and multiple variations of it to no avail. Could really use some help setting up the equation.

What do you mean when you say that you "tried" 17000(1/3)^n "and multiple variations of it"? What did you do with them?

Also, if the area drops by one third, how much of the area is left?