Answer: Choise A and Choise B.
Step-by-step explanation:
Given the following expression:

You can simplify it in order to find equivalent expressions.
Appying the Distributive Property, you get:

So:
1. If you add the like terms, you get this equivalent expression:

2. But if you factor out 3, you get the following equivalent expression:

Therefore, the expression shown in Choice A and Choise B are equivalents to the expression 
Answer:
The answer is 13.005
Step-by-step explanation:
PEMDAS
paranthesis exponents multiplication division addition subtraction
Given that the cube has a length given by 4/5n inches, the volume will be given by:
volume=length*width*height
but since it's a cube:
length=width=height
volume=(4/5n)^3
=64/125n^3 cubic inches