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July 28, 2014

Homework Help: College Algebra

Posted by Rick on Thursday, December 1, 2011 at 8:38pm.

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When a person has a cavity filled, the dentist typically administers a local anesthetic. After leaving the dentist's office, one's mouth often feels numb for several hours. If a shot of anesthesia is injected into the bloodstream at the time of the procedure (t=0), and the amount of anesthesia still in the bloodstream t hours after the initial injection is given by A=A0e^-0.5t, in how many hours will only 10% of the original anesthetic still be in the bloodstream?

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