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1. Pharmacologists have shown that penecillin leaves a person's bloodstream at a rate propor- tional to the amount present. If 100 mg of penicillin remains

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1. Pharmacologists have shown that penecillin leaves a person's bloodstream at a rate propor- tional to the amount present. If 100 mg of penicillin remains in the bloodstream 9 hours after an initial injection of 800 mg, (a) how many mg will be present after 12 hours? (b) at what time will only 25 mg remain

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