The amount of a drug in a person's bloodstream can be modeled with exponential decay. Suppose that, in 3 hours, 18% of the drug is removed from the bloodstream. What is the half-life of the drug?
A) 8.1 hours
B) 8.7 hours
C) 9.3 hours
D) 9.9 hours
E) 10.5 hours

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E. Use the exponential decay formula

Can you show me how to set it up?

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