x^2-15x+14=0
Delta = (-15)^2-4*1*14 = 169 = 13^2
so x=(15-13)/2=1 or x=(15+13)/2=14
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If you mean 5x = 140 then the value of x is 140/5 = 28
3.1416 x 140 feet = 440 feet (approx)
SQRT 14 x sqrt 10 is same as sqrt (14 x 10) = sqrt 140 sqrt 140 = 11.83
If this is a rhombus then the area is half the product of the diagonals - 10 x 14 = 140. Half of 140 = 70, so the area is 70 square feet.
from the back of the football endzone to the other is 120 yards. think about a field that is 140 yards one way and 140 yards the other way. if all sides of the field were about 140 yards long then that would be 2000 square meters.