Answer:
it's 3
Step-by-step explanation:
it went up 7 floors and went down 4 floors, if you subtracted those it will be 3. 
 
        
             
        
        
        
Answer:
x+4=10 3x=18 and x/2=3
Step-by-step explanation:
x=6 substituting the value,
x+4
=6+4
=10
3x
=3×6
=18
x/2
=6/2
=3
 
        
             
        
        
        
Answer:
Yes, there's a solution. x=1, y=0
Step-by-step explanation:
-2x+2=2x-2
4x=4
x=1
y=2×1-2=0
 
        
                    
             
        
        
        
Answer:no
Step-by-step explanation:
Bc no