Answer:
x = 8
x = -8
Step-by-step explanation:
The diagonal is the hypotenuse of a right triangle with the sides of the square as legs.
By Pythagoras (s = side)
s^2 + s^2 = 15^2
2s^2 = 225
s^2 = 112.5
s = sqrt(112.5)
s = 10.6 cm (to the nearest tenth)
Because if there is no more supplies for the sale, the sale can't apply to nothing!
