HELP TIMED TEST can someone please help me and tell me the answer ASAP. she said the answer is not 10 but I think it is PLEASE HELP

What is the value of x in the diagram below?

Graph the equationy=x^2 -[tex]y = x^{2} - 2[/tex]

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