Answer:144 ft³
Explanation:
The width of the sandbox is half of its length, so we can start by finding the length:
Length = 12 feet
Width = 1/2 * Length = 1/2 * 12 feet = 6 feet
Height = 2 feet
The volume of sand needed to fill the sandbox is the product of its length, width, and height:
Volume = Length * Width * Height
Volume = 12 feet * 6 feet * 2 feet
Volume = 144 cubic feet