Solve these systems of equations. 1. {2x-y=11 {5x-y=10 x=? y=? 2. {x+2y=25 {-x+7y=56 x=? y=? 3. {3x-2y=7 {x+2y=13 x=? y=?

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?

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?

The functions below show the amount of money bella and sweet t had saved after earning money for doing chores. which description best compares the two functions?