Which describes all the lines that must be parallel?
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For a cube, 
The volume is the cube of the side length.
To raise a product to an exponent, raise each factor to the exponent.
To raise a power to a power, multiply powers.
The volume is the cube of the side length.
To raise a product to an exponent, raise each factor to the exponent.
To raise a power to a power, multiply powers.