Answer:
-15x-6
Explanation:
Combine like terms: -9x + -6x is -15x. 7+ -13 is -6 
 
        
             
        
        
        
I think it's B. the period when the Roman Empire experienced peace and prosperity 
 
        
             
        
        
        
Answer:
As the first Roman emperor to claim conversion to Christianity, Constantine played an influential role in the proclamation of the Edict of Milan in 313, which decreed tolerance for Christianity in the empire. He called the First Council of Nicaea in 325, at which the Nicene Creed was professed by Christians.
 
        
             
        
        
        
c is the answer to this question.