milk was on sale for 2.80 a gallon. if the sale price was 80% of the regular price, how much dooes one gallon of milk regular cost

What is the volume of the sphere shown below with a radius of 3?

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

The numbers on a football field indicate 10 yard increments. you walk around the perimeter of a football field between the pylons. you walk a distance of 30623 yards. find the area and perimeter of the indicated regions. write your answers as mixed numbers, if necessary. a. one end zone: perimeter: yd area: yd2 b. the playing field (not including end zones): perimeter: yd area: yd2 c. the playing field (including end zones): perimeter: yd area: yd2