To find the volume of a cube, you use the formula:
\[ \text{Volume} = \text{edge length}^3 \]
In this case, the edge length is \(2.5\) feet. So, we calculate:
\[ \text{Volume} = (2.5)^3 = 2.5 \times 2.5 \times 2.5 \]
Calculating step-by-step:
- \(2.5 \times 2.5 = 6.25\)
- \(6.25 \times 2.5 = 15.625\)
Thus, the volume of the cube is \(15.625\) cubic feet.
To express this to the nearest thousandth, it is already at:
\[ \text{Volume} = 15.625 \text{ cubic feet} \]
Therefore, the volume of the cube is \(15.625\) cubic feet.