Answer:
The volume of the cube is;
[tex]91.125ft^3[/tex]Explanation:
Given that the Volume of a cube is;
[tex]V=n^3[/tex]The volume of a cube shaped fish tank with the side n of 4.5ft;
[tex]n=4.5\text{ ft}[/tex]Substituting the value of n;
[tex]\begin{gathered} V=(4.5ft)^3 \\ V=4.5\times4.5\times4.5ft^3 \\ V=91.125 \\ V=91.125ft^3 \end{gathered}[/tex]Therefore, the volume of the cube is;
[tex]91.125ft^3[/tex]