Answer:
Let x = the third side
  
In a triangle, the sum of any 2 sides must be larger than the third side.
I believe this is called the triangle inequality theorem.
  
We can construct 3 inequalities to obtain the range of values for the third side.
  
   (Inequality #1)   12 + 4 > x
                                   16 > x
  
   (Inequality#2)    12 + x > 4
                                     x > -8   (we can discard this ... we know all sides will be positive)
  
   (Inequality #3)   4 + x > 12
                                    x > 8
  
So when we combine these together,  
  
    8 < x < 16
  
X (the third side) must be a number between 8 and 16. but not including 8 and 16 
 
        
             
        
        
        
Answer:
I’m not really sure
Step-by-step explanation:
Look at someone else’s answer
 
        
             
        
        
        
Answer:
she used square unit instead of cubic units
in calculating the volume of the pyramid she didn't multiply by 1/3
she subtracted the pyramid volume instead of adding it
 
        
                    
             
        
        
        
Answer:
13.015625
Step-by-step explanation: