How would you multiply a monomial with a polynomial? (Please answer fast )

What are the relative frequencies to the nearest hundredth of the columns of the two-way table?

Need solving this second acceleration problem.

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?