NEED SOME SERIOUS CHEMISTRY HELP PEOPLE. Iron-59 has a half-life of 45.1 days. How old is an iron nail if the Fe-59 content is 25% that of a new sample of iron? Show all calculations leading to this answer.

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Do you know the exponential decay equation?

noooooo.... @JoannaBlackwelder I don't. Honestly I don't understand this one bit...

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