How many 400 mg capsules are needed to prepare 120ml of a 40% solution

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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?

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary