The question is in the image h e l p m e

2x - 20 = 32 20 - 3x = 8 6x - 8 = 16 -13 - 3x = -10

4. find the geometric mean of 4 and 12. 24 8

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?