6+9/3+16-4*2;29 parenthisis

How do i make someone brainliest? (if you answer me, i might be able to make you brainliest! )

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?