An unknown radioactive element decays into non-radioactive substances. In 560 days the radioactivity of a sample decreas

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An unknown radioactive element decays into non-radioactive substances. In 560 days the radioactivity of a sample decreas

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An unknown radioactive element decays into non-radioactive substances. In 560 days the radioactivity of a sample decreases by 70 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 88 mg?time needed: (days)
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