Mrs thomas wants to find the price charged for the same stereo speaker at different stores

What term makes it inconsistent y=2x - 4 ?

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?

Common binomial factor of 6x(3x+7)+5(3x+7)