Surface area and volume in a cube, please help

Answer:
[see below]
Step-by-step explanation:
Figure B is a cube.
Surface area of a cube is:
[tex]A=6a^2[/tex]
The measurement given is [tex]7.2 \text{ft}[/tex].
[tex]A=6(7.2)^2\\\\A=6(51.84)\\\\A=\boxed{311.04}[/tex]
Option D should be the correct answer.
Volume of a cube is:
[tex]V =a^3[/tex]
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[tex]V=(7.2)^3\\\\V=\boxed{378.248}[/tex]
Option D should be the correct answer was well.
Hope this helps you.