Solve the problem.A pharmaceutical company claims that the concentration of a drug in a patient's bloodstream will be at least 25% for 8 hours. Suppose that clinical tests show that the concentration of the drug (as a percent) t hours after injection is given by 
During what time period is the concentration at least 25%?
A. 1 hours ? t ? 9 hours
B. 1 hours ? t ? 5 hours
C. 0 hours ? t ? 8 hours
D. 2 hours ? t ? 10 hours
Answer: B
Mathematics
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