21. if there are 6 air conditioners and each require 8 pounds of refrigerant, how many pounds of
refrigerant are needed to fill all 6 air conditioners?

Two lines parallel to a third line are parallel to each other. always sometimes or never

We just started the introduction into circles and i have no idea how to do this.

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?