Step-by-step explanation:
Statement | Reason
CB=AB         Given
DBC=DBA   Given
DB = DB      Reflexive Property
/_\ DBC 
=~
/_\DBA        SAS
Sorry for the formatting the =~ means congruent. 
 
        
             
        
        
        
1.07142857143this is the answer i'm sure
        
                    
             
        
        
        
Take -920/360 = -2.55555
Take the fraction part -0.5555555 * 360 = -200
The positive of that would be 160 degrees
        
                    
             
        
        
        
Answer:
12a^2 - 9a + 5 
Step-by-step explanation:
(5a^2 - 6a - 4) - (-7a^2 + 3a - 9)
5a^2 + 7a^2 = 12a^2
-6a - 3a = -9a
-4 + 9 = 5
12a^2 - 9a + 5