Como aser el numero 15 con las palabras tally marks

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?

Hundred and tens tables to make 430 in five different ways

The difference between the number of electoral votes for florida and north carolina is 12 votes. write and solve a subtraction equation to find a number of electoral votes for florida.