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An unknown radioactive element decays into non-radioactive substances. In 340 days the radioactivity of a sample...

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Advance Math

An unknown radioactive element decays into non-radioactivesubstances. In 340 days the radioactivity of a sample decreases by37 percent. (a) What is the half-life of the element? (b) How longwill it take for a sample of 100 mg to decay to 74 mg? time needed:(days)

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