Find the value of x, o is the centroid

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

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

Zahra wants the equation below to have an infinite number of solutions when the missing number is placed in the box.