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? (1 point)

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.

Question

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? (1 point)
 
  
 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.

cwrw238 · Answer

just suppose we started with 10 tons of fuel which contained 4 tons of pollutants and the tube was 2 feet long and the percentage of pollutants removed each foot was 20%. 
work out the percentage of pollutants f(x) . remaining after passing through the tube and see what you get. How does that fit the formula?

anonymous · Answer

Yeah I don't really get what you mean

secret-ninja · Answer

Its A. :)