Triangle ABC is similar to triangle XYZ solve for t

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?

How do you do the foil method with polynomials?

Need same math paper but the back now i hope your able to read it cleary i need with hw