Answer:
D is the correct answer
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
The answer is 9 (B)
Step-by-step explanation:
I got 9 because you have to plug in answer (7, 9, 11, 8) in each equation than add them both together. I first plugged in 7 for x in the equation 9x-5. I got 58. I plugged in 7 for x in the equation 5x+12 and got 47. When I added both the answers together I got 105. The answer was to low because SU has to be 133. I plugged in 9 for x in both equations then added them both and got 133 for SU. I hope this helps. 
 
        
                    
             
        
        
        
3420°
explanation:
the equation of the sum of interior angles are (n-2)x180 
polygon above has 21 sides so you sub n as 21 and plug the equation in the calculator 
 
        
                    
             
        
        
        
Answer:
 Cory is correct
Step-by-step explanation:
When you divide 3.9 by 0.52 the quotient is 7.5. 7.5 will round up to 8.