C-d=b add to both sides d and will get 
c-d+d=b+d
c=b+d
hope helped 
        
             
        
        
        
Answer:All real numbers 
Step-by-step explanation:
 
        
                    
             
        
        
        
Use the following formula valid fo every polyhedron. 
v-e+f=2 
<span>
Search for Euler characteristic, or Euler-Poicare characteristic for more depth about this formula </span>
v= number of vertices 
e=number of edges 
f=number of faces 
<span>You get v=13
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Answer:
B. the second one
Step-by-step explanation: