Final answer:
In a cube, the number of unit cubes on each layer can be determined by finding the volume of that layer.
Step-by-step explanation:
In a cube, each layer represents a horizontal slice of the cube. The number of unit cubes on each layer can be determined by finding the volume of that layer. To find the volume, we can use the formula: length x width x height. So, for the given layers, the number of unit cubes are:
- Layer 1: 18 unit cubes
- Layer 2: 16 unit cubes
- Layer 3: 64 unit cubes
- Layer 4: 27 unit cubes