Rationalize the denominator. Assume that all variables represent positive real numbers.- 
A. - 
B. - 
C. - 
D. - 
Answer: B
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Convert to a percent.
A. 90% B. 95% C. 80% D. 100%
Perform the division. Write the answer with positive exponents.
A. 4x - 7 + 
B. 4x - 7 + 
C. 4x2 - 7 + 
D. 4x2 - 7 + 
Solve the proportion.
= 
A. 2 B. 5 C. 4 D. 3
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 46 to 55 liters of air are
filtered.
B. 
75% to 90% are removed when
about 38 to 46 liters of air are
filtered.
C. 
75% to 90% are removed when
about 25 to 31 liters of air are
filtered.
D. 
75% to 90% are removed when
about 31 to 38 liters of air are
filtered.