the sum of supplementary angles is 180 degree
therefore 
x +2x = 180°
3x = 180
X = 180/3 = 60° 
the value of X is 60° 
 
        
             
        
        
        
Answer:
t=-2
Step-by-step explanation:
(t+9)20=140 
Distribute the 20
20t +180 = 140
Subtract 180 from each side
 20t +180-180 = 140-180
20t = -40
Divide by 20
20t/20 = -40/20
t=-2
 
        
                    
             
        
        
        
Answer:
1
Step-by-step explanation:
i am not sure but that is what i got.