Find the distance between the points 2, 8 and - 1, 9

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?

Multiplying fractions by whole number 5 x 1/3=?

Add. express your answer in simplest form. 12 9/10+2 2/3 = i need u guys to me find the answer to this question