SOLUTION: Sodium-24 is used for medical purposes. The half-life of sodium-24 is 14.9 h. A hospital buys 480 mg. After how long will 3.75mg remain?

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Question 933434: Sodium-24 is used for medical purposes. The half-life of sodium-24 is 14.9 h. A hospital buys 480 mg. After how long will 3.75mg remain?
Answer by josgarithmetic(39627) About Me  (Show Source):
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Seven half-life periods.
104.3 hours.