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A 100 gram sample of unknown radioactive element decays into non-radioactive substances. In 440 days the radioactivity of a sample decreases so only 63 grams

A 100 gram sample of unknown radioactive element decays into non-radioactive substances. In 440 days the radioactivity of a sample decreases so only 63 grams remain. Use the equation, A(t)=Aoekt. Round answers to the nearest hundredth. (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 36 mg? time needed: (days)

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