Seven units to the left of the 0 on a number line would = -7 thus answer 3 being the correct answer
        
                    
             
        
        
        
[ Answer ]

[ Explanation ]
- System Of Equations  
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- Isolate x for x + x + 10 = 10: x = 0
For y = 10
Substitute x = 0
Y = 0 + 10
0 + 10 = 10
y = 10
X = 0
Y = 10
![\boxed{\bold{[] \ Eclipsed \ []}}](https://tex.z-dn.net/?f=%5Cboxed%7B%5Cbold%7B%5B%5D%20%5C%20Eclipsed%20%5C%20%5B%5D%7D%7D)
 
        
             
        
        
        
Answer:  $15 
 
Step-by-step explanation:
To find the markup price just multiply 30% by the amount. 
30% * 50  
 0.3 * 50 = 15
 
        
                    
             
        
        
        
Answer and explanation
You add all of the digits together a see if it is divisible by 3 sooooo...........
5+3+6+1=15/3=5