Answer:
actually what is this is you is this a geometry, trigonometry I don't know what to call
 
        
             
        
        
        
-7 and 5. The product would be -35 and the sum -2.
Hope this helps
 
        
             
        
        
        
Answer:
divide the determine by 2 and your answer will match the radius
 
        
             
        
        
        
The answer is B. 10 vertices because it all depends on the edges. You have to subtract the edges by faces/vertices to get your faces/vertices so 20-12 is 10 so you are correct