16. i would have to redraw it and i’m not sure how explain

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?

Which of these figures must be a rectangle?

Acar travels 85 kilometers per hour. what is the equivalent speed in meters per hour?