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If 60% of a radioactive element remains radioactive after 400 million​ years, then what percent remains radioactive after 500 million​ years? What is the​ half-life of this​ element?
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If 60% of a radioactive element remains radioactive after 400 million​ years, then what percent remains radioactive after 500 million​ years? What is the​ half-life of this​ element?

User John Strickler
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Son this is too hard and I am a professor in a University.
User Savena
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