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 
Graph f in [0,85,5] by 
Then, use the intersection-of-graphs method to estimate the x-values where 70% to 95% of the pollutants are removed.
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A. 70% to 95% are removed when
about 22 to 30 liters of air are
filtered.
B. 70% to 95% are removed when
about 32 to 44 liters of air are
filtered.
C. 70% to 95% are removed when
about 25 to 35 liters of air are
filtered.
D. 70% to 95% are removed when
about 39 to 52 liters of air are
filtered.
Answer: B
Mathematics
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