Answer: First Question: True
Second Question: False 
Third Question: False
Step-by-step explanation:
Based on the equations in the image, I used the substitution method.
 
        
             
        
        
        
(2x + 3) + (x+1) + (3x-10) = 180
6x - 6 = 180
6x = 186
x= 31
        
                    
             
        
        
        
The answer is 36in because that’s the pathagreom you need to use to find the answer