Answer:
6.
Step-by-step explanation:
 
        
             
        
        
        
It would be 30 degrees since a line is 180. You subtract 150 from 180 and get 30.
        
                    
             
        
        
        
Answer:
164
Step-by-step explanation:
2x+7+5x+12=180
7x+19=180
7x+180-19
7x=171
----  ----
7      7
x=164
 
        
                    
             
        
        
        
Step-by-step explanation:
This figure has 1 line of symmetry
 
        
             
        
        
        
Answer:
All real values, (-∞, ∞)
Step-by-step explanation:
<u>Step 1:  Distribute</u>
5y + (86 - y) = 86 + 4y
5y + 86 - y = 86 + 4y
<u>Step 2:  Combine like terms</u>
5y + 86 - y = 86 + 4y
4y + 86 = 86 + 4y
<u>Step 3:  Subtract 4y from both sides</u>
4y + 86 - 4y = 86 + 4y - 4y
86 = 86
<u>Step 4:  Subtract 86 from both sides</u>
0 = 0
Answer:  All real values, (-∞, ∞)