Pls answer this correctly and I will mark it has brainlist

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?

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall

Which compound inequality could be represented by the graph?