Which is not a polynomial?

a. 4/x^4 + 3/x^3− 2/x^2 −1

b. x^5 − 5x^4 + 4x^3 −3x^2

c. 3x^2 + 5x^4 + 2x − 12
d. x^3− 7x^2 + 9x −20

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

How is the interquartile range calculated?

Would greatly appreciate these 3 answers