5 freshmen and 5 seniors stand in a line. How many possible arrangements are there if the freshman stand together and the seniors stand together?

Bismuth-210 is an isotope that radioactively decays by about 13% each day, meaning 13% of the remaining bismuth-210 transforms into another atom (polonium-210 in this case) each day. if you begin with 233 mg of bismuth-210, how much remains after 8 days?

Name the most appropriate metric unit for each measurement like the mass of cow

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