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Mathematics, 04.12.2020 21:30 LAMARTINEZ321

After the release of radioactive material into the atmosphere from a nuclear power plant at Chernobyl (Ukraine) in 1986, the hay in Austria was contaminated by iodine 131 (half-life 8 days). It is safe to feed the hay to cows when 10% of the iodine 131 remains.
1. What is the exact growth/decay factor?
2. How long did the farmers need to wait to use this hay?

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