Answer:
Each plane cuts the other two in a line and they form a prismatic surface. ... The second and third planes are coincident and the first is cuting them, therefore the three planes intersect in a line.
Step-by-step explanation:
 
        
             
        
        
        
Answer:
it would be 20 I'm not 100 percent tho
 
        
             
        
        
        
You only can if 341 has a decimal of some sorts. other than that, you cannot round it.
        
                    
             
        
        
        
Answer:
Surface Area varies by object/shape. 
Ask your teacher/learning helper for those formulas of surface area
Step-by-step explanation:
Surface area is the sum of all faces (or surfaces) on a 3D shape. A cuboid has 6 rectangular faces. To find the surface area of a cuboid, add the areas of all 6 faces. We can also label the length (l), width (w), and height (h) of the prism and use the formula, SA=2lw+2lh+2hw, to find the surface area.
 
        
             
        
        
        
For 1
Twice a number means 
A number used two times
Is that number was x
What do we do to x