An airplane descended 4,000 feet before landing. the integer that represents how many feet the airplane was above the ground before its decent is

What is the value of the digit 1 in the number 13?

Sorry guys but as you have a small brain

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?