A fuel is purified by passing it through a clay pipe. Each foot of the clay pipe removes a fixed percentage of impurities in the fuel. Let f (x) represent the amount of pollutants, in tons, left in the fuel after it had passed through x feet of the clay pipe.
f (x) = 10 (0.8) x
What does the number 0.8 represent?
Every foot of the pipe removes 20% of the pollutant.
Every foot of the pipe removes 80% of the pollutant.
The original amount of pollutant present in the fuel was 80 tons.
The original amount of pollutant present in the fuel was 20 tons.
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