(01.05 MC)The total charge on 6 particles is −48 units. All the particles have the same charge. What is the charge on each particle? −9 units −8 units 8 units 9 units

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?

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How do i do this activity, is appreciated