From the given information, we know that the volume of the cube is 64 cm³.
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The formula for the volume of a cube is given by \( V = s^3 \), where \( s \) is the side length. To find the side length, we can take the cube root of the volume: \[ s = \sqrt[3]{64} = 4 \text{ cm} \]
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Therefore, we can conclude:
- The side length is 4 cm.
- Taking the cube root of its volume will determine its side length.
The other options (side length being 8 cm and using \( s^2 \)) are incorrect based on the volume provided.
So the correct responses are:
- The side length is 4 cm.
- Taking the cube root of its volume will determine its side length.