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(1 point) An unknown radioactive element decays into non-radioactive substances. In 200 days the radioactivity of a sample decreases by 37 percent. (a) What

(1 point) An unknown radioactive element decays into non-radioactive substances. In 200 days the radioactivity of a sample decreases by 37 percent. (a) What is the half-life of the element? half-life (days) (b) How long will it take for a sample of 100 mg to decay to 42 mg? time needed (days)

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