Answer:
add all the sides that you have and subtract it from 180
Step-by-step explanation:
I don’t even know I just want to get points
Answer:
21
Step-by-step explanation:
1/5 * 35 = 7
7*3 = 21
There should be a typo in the question: the correct formula would be

Let's compute
first. We have

If we intersect this set with X, we have

So, that would be the left hand side. For the right hand side, we have

And their union is again 
For this case we have that by definition, the volume of a rectangular prism is given by:

Where:
It is the area of the base
h: It is the height
So:

The volume of the prism is:

Now, the volume of the cubes is:

Thus, we divide and find the number of cubes to fill the prism:

ANswer:
n = 2.5