Which expression is equivalent to 4 sqrt 6 / cube root 2

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?

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

How do i do this activity, is appreciated