<PRE><B>Question 1100951</B>
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). 
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year 1 :: 160 acres
year 2 :: 160(4/5) acres
year 3 :: 160(4/5)^2 acres
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year n :: 160(4/5)^(n-1) acres
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Cheers,
Stan H.
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