SOLUTION: The area covered by a marsh, A, starts at 160 acres. Each year for n years 1/5 of the marsh vanishes. Write a formula for A = f(n). I got 160(1/5)^n but for some reason it say

Question 1100951: The area covered by a marsh, A, starts at 160 acres. Each year for n years 1/5 of the marsh vanishes. Write a formula for A = f(n).
I got 160(1/5)^n but for some reason it says its wrong
Found 2 solutions by KMST, stanbon:
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
Each year of the marsh disappears and you are left with
of what you had the year before.
or .
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
The area covered by a marsh, A, starts at 160 acres. Each year for n years 1/5 of the marsh vanishes. Write a formula for A = f(n).
----
year 1 :: 160 acres
year 2 :: 160(4/5) acres
year 3 :: 160(4/5)^2 acres
---
year n :: 160(4/5)^(n-1) acres
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Cheers,
Stan H.
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