Luke is 5 years younger than 3 times sydney’s age, s . in this situation , what does 3s represent?

How many solutions does the nonlinear system of equations graphed bellow have?

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?

Ithink i know it but i want to be sure so can you me out ?