Answer:
you need to add the equations in my guy
Step-by-step explanation:
 
        
             
        
        
        
Answer:
15
Step-by-step explanation:
if you put x=-15
f(x) = 5*-5 +40
=-25+40
=15
 
        
             
        
        
        
The answer to the question
 
        
        
        
Answer: I'm just answering so if only one person answers then u can give the other person brainliest. 
Step-by-step explanation:    Also if nobody is answering u might want to repost this question