Answer:
R = (- 3.5, - 7 )
Step-by-step explanation:
Using the Section formula
 =
 =  =
 =  =
 =  = - 3.5
 = - 3.5
 =
 =  =
 =  =
 =  = - 7
 = - 7
Thus coordinates of R = (- 3.5, - 7 )
 
        
                    
             
        
        
        
Answer:
he made the mistake on step one, he didn't distribute correctly 
Step-by-step explanation:
-5(x-1) = -5x +5
not -5x - 1
 
        
                    
             
        
        
        
Answer:
108, 108, 72
Step-by-step explanation:
Vertical angles are congruent and if the measure of 1 of the angles is 72 degrees and straight lines equal 180 degrees you have to subtract 72 from 180 which equals 108. 
 
        
             
        
        
        
The answer to your question is 11