X is 30 because
x-4x=-90
-3x=-90
x=30
40*9.2=360.8
10.7*2.25=24.075
360.8
+24.075
384.875. I disagree he actually made 384.875 dallors
Germany, Italy, Japan (axis powers)
Great Britain, Soviet Union, France (allies)
If you only want 5 take out japan
This solid object contains 8 sides.
The side that is facing you has a surface area:
The side exactly opposite this one has the same surface area - 2 sides with this surface area in total.
The bottom side has a surface area:
![84f{ t }^{ 2 }](https://tex.z-dn.net/?f=84f%7B%20t%20%7D%5E%7B%202%20%7D)
The side to your right has a surface area:
![84f{ t }^{ 2 }](https://tex.z-dn.net/?f=84f%7B%20t%20%7D%5E%7B%202%20%7D)
The side to your left has a surface area:
![48f{ t }^{ 2 }](https://tex.z-dn.net/?f=48f%7B%20t%20%7D%5E%7B%202%20%7D)
The side to your top left has a surface area:
![48f{ t }^{ 2 }](https://tex.z-dn.net/?f=48f%7B%20t%20%7D%5E%7B%202%20%7D)
The side beside the side to the top left has a surface area:
![36f{ t }^{ 2 }](https://tex.z-dn.net/?f=36f%7B%20t%20%7D%5E%7B%202%20%7D)
The side at the very top has a surface area:
![36f{ t }^{ 2 }](https://tex.z-dn.net/?f=36f%7B%20t%20%7D%5E%7B%202%20%7D)
Combined, the surface area is:
![S=2\cdot 148f{ t }^{ 2 }+2\cdot 84f{ t }^{ 2 }+2\cdot 48f{ t }^{ 2 }+2\cdot 36f{ t }^{ 2 }](https://tex.z-dn.net/?f=S%3D2%5Ccdot%20148f%7B%20t%20%7D%5E%7B%202%20%7D%2B2%5Ccdot%2084f%7B%20t%20%7D%5E%7B%202%20%7D%2B2%5Ccdot%2048f%7B%20t%20%7D%5E%7B%202%20%7D%2B2%5Ccdot%2036f%7B%20t%20%7D%5E%7B%202%20%7D)
Therefore the answer is: C