If all triangles have three sides then?

What is the product? (x2+3y+7) [yy+1)

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 term best describes a line ans a point that lie in the same plane