Answer:
-5
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
-3 I think
Step-by-step explanation:
well 10-7=3 and 13-10=3 
but since it is greater number first it would make it a -3
 
        
             
        
        
        
I reallly dont know but that long is going to end up long
        
             
        
        
        
Answer:
Step-by-step explanation:
Domain : Set of all possible input values (x-values) on a graph
Codomain : Set of all possible out values for the input values (y-values) on the graph
Range : Actual output values for the input values (x-values) given on the graph.
Therefore, for the given graph,
Domain : (-∞, ∞)
Codomain : (-∞, 2]  
Range : (-∞, 2] 
From the given graph every input value there is a image or output value.
Therefore, the given function is onto.