'3' question: Submit test 1 point(s) possible After the release of radioactive material into the atmosphere from a nuclear power plant in a country in 1999. the hay in that country was contaminated by a radioactive isotope (half-life 6 days). If it is safe to feed the hay to cows when 12% of the radioactive isotope remains, how long did the farmers need to wait to use this hay? ' M The farmers needed to wait approximately [I days for it to be safe to feed the hay to the cows. (Round to one decimal place as needed.)