Answer: 15.625 mm³
Step-by-step explanation: Since the length, width, and height of a cube are all equal, we can find the volume of a cube by multiplying side x side x side so we can find the volume of a cube using the formula S³.
Notice that we have a side length of 2.5 millimeters so plugging into the formula we have (2.5 mm)³ or 2.5 mm x 2.5 mm x 2.5 mm which is 15.625 mm³.