What are the two whole numbers that are closest to the square root of 135?

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?

What is the remainder when 2872 is divided by 76? a) 51 b) 57 c) 60 d) 63

Which expression gives you the distance between the points (5,1)and(9,-6)