Hiroaki says that the constant of proportionality must be a whole number and cannot be a fraction or decimal. Explain why Hiroaki is incorrect. ( this is due tmr pls help me )

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?

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

For how answer my question this will be the last question can you answer in math subject