The formula for determining the volume of a box is expressed as
Volume = lenght * width * height
From the information given,
length = 14 inches
height = 9 inches
width = 1.4 feet
We would convert 1.4 feet to inches. Recall,
1 foot = 12 inches
1.4 feet = 1.4 * 12 = 16.8 inches
Thus,
Volume = 14 * 16.8 * 9
Volume = 2116.8 inches^3