The price of a gallon of unleaded gas was $2.78 yesterday. Today, the price rose to $2.84. Find the percent of increase. Round you’re answer to the nearest tenth of a percent.

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?

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Find the area of the regular hexagon if a side is 20 cm.