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| PAGE: 180 | SET: Exercises | PROBLEM: 78 |
a.
Find an exponential function to model the percent of impurity left after the kerosene travels x feet.
of the impurities are removed for every foot.
Since 
of the impurities are removed for every foot remaining impurities 
.
The percent of impurity left after the kerosene travels x feet is 
.
b.
The function .
Graph of the function .
c.
Find percent of the impurity remains after the kerosene travels 
feet.
Substitute 
in .
.
Percent of the impurity remains after the kerosene travels 
feet is 
.
d.
No, because the graph has a horizontal asymptote 
, so the percentage of impurities never reach to 
.
a.
The percent of impurity left after the kerosene travels x feet is .
b.
Graph of the function is :
c.
Percent of the impurity remains after the kerosene travels feet is 
.
d.
The percentage of impurities never reach to 
.
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