Answer: x = 84cm
Volume of a rectangular prism = L x w x h / 3
Where L = length
W = width
H = height
Volume = 280 cubic centimeters
Height = 14cm
Length = 6 cm
Width = xcm
280 = 14 * 6 * x / 3
280 = 84 * x / 3
280 = 84x / 3
cross multiply
280 x 3 = 84x
840 = 84x
Divide both sides by 84
840/84 = 84x
x = 840/84
x = 10 cm
The value of x is 84cm