What makes the equation true?
4(-x+2) = -(x+3) - 2x

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?

Can any one me with the answers to these questions asap?

How many $20 bills do you need to have to make $280