we have
 ----> inequality 1
 ----> inequality 1
The solution of the inequality 1 is the shaded area below the solid red line 
The solution is the region D and region C
 -----> inequality 2
 -----> inequality 2
The solution of the inequality 2 is the shaded area above the solid blue line 
The solution is the region B and region C
The solution of the system is the common area 
so
The solution is the region C
see the attached figure
therefore
the answer is the option C
Region C
 
        
                    
             
        
        
        
Answer:
Second option
Step-by-step explanation:
For a set to represent a function, each input value in the set domain should match with one and only one output value of set range.
The option that follows this rule os second option as 1 is matched with 2 only, and 3 is matched with 3 only, and 5 is matched with 7 only.
 
        
             
        
        
        
Answer:
the number is X=2
Step-by-step explanation:
<em>Suppose number is X</em>
8X-1 =X+13
8X-X= 13+1
7X=14
X=2