They box would be 4 inches tall. This is because in a(n) equation/formula it would be: V = bh
18 inches cubed = 4 1/2 inches squared • h
In this case, you would have to divide 18 inches cubed by 4.5 inches squared and would get 4 inches. Therefore, 18 inches cubed = 4 1/2 inches squared • 4