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help and ill upvote An unknown radioactive element decays into non-radioactive substances. In 560 days the radioactivity of a sample decreases by 56 percent. (a)

help and ill upvote
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An unknown radioactive element decays into non-radioactive substances. In 560 days the radioactivity of a sample decreases by 56 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 64 mg? time needed: (days)

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