Can someone help me with this ASAP please I’m being timed

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?

Write an expression that has three terms and simplifies to 4x - 7. identify the coefficient(s) and constant(s) in your expression

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°