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Take ln for both sides and you're almost done.
Not quite good with these, as we still didn't study logarithms in school. But I think \[\ln \] will help solve the thing.
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Thanks mate. I'll be taking Maths Level 2 Sunject Test in a month, so I'll get to use logarthims quite a bit :)
Good Luck! :)
@remidia, did you get the idea here?
No, this whole problem is really confusing me. The problem in its entirety is
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