Answer: 
Step-by-step explanation:
For this exercise it is important to remember the following:

Given the following expression:

You can notice that the radicand (the number inside the square root) is negative. Therefore, in order to simplify the expression, you need to follow these steps:
1. Replace
with
and simplify:

2. Descompose 12 into its prime factors:

3. Substitute into the expression:

4. Since
, you can simplify it:

6x5+24x3+3x3+12x ------> Simplify by adding like terms
6x5 + 27x3 + 12x
The equation for the volume of a cube is V=s^3, where V is volume and s is side length. Plug in and solve:
V=4.5^3
V=4.5*4.5*4.5
V=91.125ft^3
Hope this helps!!
Answer:
161,084,000
Step-by-step explanation:
7 x 11,506,000 = 80,542,000
80,542,000 x 2 = 161,084,000