What is the area of the circle?

Although changes result from business transactions, the equality of the fundamental bookkeeping equation must remain. t/f

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?

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?