Solve the problem.A certain electronic air cleaner is capable of filtering x liters of air per second and the percentage of the contaminants that are removed from the air may be calculated by 
where 
(i) Graph f in [0, 85, 5] by 
(ii) Use the intersection-of-graphs method to estimate the x-values where 75% to 90% of the pollutants are removed.
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A. 
75% to 90% are removed when
about 42 to 50 liters of air are
filtered.
B. 
75% to 90% are removed when
about 25 to 30 liters of air are
filtered.
C. 
75% to 90% are removed when
about 35 to 43 liters of air are
filtered.
D. 
75% to 90% are removed when
about 26 to 31 liters of air are
filtered.
Answer: C
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