The volume of a rectangular box is given by the formula V = LWH, where L is the length, W is the width, and H is the height. In this case, we have:
V = 9720 cm^3
L = 30 cm
W = 18 cm
We want to find H.
Substituting the given values into the formula for the volume, we get:
9720 = (30)(18)(H)
Simplifying this equation, we get:
H = 9720 / (30 * 18)
H = 18 cm
Therefore, the height of the jewelry box is 18 cm !