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26 December, 09:23

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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  1. 26 December, 11:06
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    Answer: first option, Every foot of pipe removes 20% of the pollulant.

    Explanation:

    20% removal means that after passing every foot of clay pipe, 80% of pollulant remains = 80/100 = 0.8

    Then the amount of pollulant left in the fuel after passing x feet will be A*0.8^x

    f (x) = 10 (0.8) ^x

    Initial amount, A = > x = 0 = > f (0) = 10 = A

    After one foot: 10 - 0.2 (10) = 10*0.8

    After two feet: 10*0.8 - 10*0.8*0.2 = 10*0.8[1-0.2] = 10*0.8*0.8 = 10*0.8^2

    After three feet: 10*0.8^3

    After n passes: 10*0.8^n
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