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Radium-226 is a metal with a half-life of 1600 years.If you start with 1 kilogram of radium-226, how much will remain after 20,000 years? The

Radium-226 is a metal with a half-life of 1600 years.If you start with 1 kilogram of radium-226, how much will remain after 20,000 years?

The current population of a threatened animal species is 1 million, but it is declining with a half-life of 25 years.How many animals will be left in 90 years?

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