2 answers:
            
              
              
                
                
Answer: 80 degrees because a line is 180°.
So if you subtract
180 - 100 = 80°
 
                                
             
                    
              
              
                
                
Answer:
x=80°
Step-by-step explanation:
The measures of angle x and the 100° angle form a straight angle.
This straight angle is 180°. 
You can subtract the measure of one angle from the whole to find the measure of the other angle.
180°-100°=80°
This means angle x is 80°.
 
                                
             
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Step-by-step explanation:
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Step-by-step explanation:
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 Answer:
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Step-by-step explanation:
 
        
             
        
        
        
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