Harry has a cube with a side length of 7 cm.

What is the volume of Harry's cube?
294 cm²
294 cm³
343 cm²
343 cm³

The volume of a cube is found by cubing the length of its sides. In this case, the volume would be 7 cm × 7 cm × 7 cm, which equals 343 cm³. Therefore, the correct answer is 343 cm³.