What are the excluded value(s)? (y^(2)+1)/(y^(2)-y-6) (-2, 3) (-1, 6) (-2, -6)

Which function has the smallest y-intercept value

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?

This is about circle theorems. someone asap : (