Final answer:
The side length of the cube is 3 units.
Step-by-step explanation:
The side length of a cube with a volume of 27 cubic units can be represented with the expression 27.
This means that the side length of the cube is equal to the cube root of 27, since the volume of a cube is equal to the side length cubed.
The cube root of 27 is 3, so the side length of the cube is 3 units.