A group of people are fundraising, and each person raises a certain amount of money for every mile they walk. Each person's fundraising is represented below using *d* for the dollars that person raises and *w* for the miles that person walks.

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?

2y= 3 2 x−2 y = − 1 3 x + 1 y=− 3 1 x+1

What expression is equivalent to 42x-56y