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Which expression is equivalent to the expression shown?

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?

Find the root(s) of f (x) = (x- 6)2(x + 2)2.