(9r³ + 5r² + 11r) + (-2r³ + 9r - 8r²)

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What could explain what happened when the time was equal to 120 minutes

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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?