-7n=63
n=-9 is your final answer. Hope it help!
        
             
        
        
        
Answer:
x = 4.
Step-by-step explanation:
These are exterior  alternate angles which are congruent.
So 21x + 6 = 90
21x = 84
x = 4.
 
        
             
        
        
        
Answer:
12
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
x ft is the answer since X = 10
so it means 10 ft