All numbers greater than zero are positive intergers. is it true or false?

Asquare parking lot has 6,400 square meters what is the length in meters

Acar travels at an average speed of 56 miles per hour. how long does it take to travel 196 miles

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?