The volume goes up by 9 times
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Volume is proportional to the cube (3rd power) of the linear dimensions.If the side of the cube is tripled, the volume increasesby a factor of (3)3 = 27 .
I'd need to review what happened in number-1 before I could answer that. I do know that if only the length of a rectanguar prism is tripled, while the other two dimensions remain unchanged, then its volume triples.
It depends on the shape. The volume of a sphere will increase differently to the volume of a cylinder, for example.
x^3
The volume becomes (3)3 = 27 times as much.