Concept explainers
Find the percent of the original contaminants will be removed from the air.
Answer to Problem 7STP
Option D is correct.
Explanation of Solution
Given:
An air filters claims to remove 90% of the contaminants in the air each time air is circulated through the filter. If the same volume of air is circulated through the filter three times, what percent of the original contaminants will be removed from the air?
4 Options are: A: 0.1%, B: 0.01%, C: 99.99%, D: 99.9%
Calculation:
After first circulation, the contaminants left in air are
After second circulation only
After the third circulation only
So,
Thus, Option D is correct.
Chapter 10 Solutions
Glencoe Algebra 2 Student Edition C2014
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