I need some help please

Franco wants to double the volume of the cone. what should he do?

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?

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.