Can you please complete your question?
        
             
        
        
        
Answer:
A linear pair of angles is formed when two lines intersect. Two angles are said to be linear if they are adjacent angles formed by two intersecting lines. The measure of a straight angle is 180 degrees, so a linear pair of angles must add up to 180 degrees.
 
        
                    
             
        
        
        
Let's just start with x=20 and then do some algebra to it to make it all complicated
x = 20
2 * x = 2 * 20
2x = 40
2x - 13 = 40 - 13
2x - 13 = 27
        
             
        
        
        
Answer:
in step 4
Step-by-step explanation:
we have

so step 1 is correct
step 2

so step 2 is correct
step 3

so step 3 is correct
step 4

so step 4 is incorrect
 
        
             
        
        
        
Answer:
109
Step-by-step explanation:
(4)28+(-3)
4*28=112
112+(-3)
112-3
109
Hope this helps, LMK if its right