-1, maybe or maybe not this is my first time doing this
 
        
             
        
        
        
Yes, substitute a=2. 
14 - 4 + 6 - 6 = -2
8 - 10 = -2
        
             
        
        
        
1) Unknown info = amount of potting soil he bought last week
2). 28=2x+4
 Where x=amount of potting soil he bought last week
3). 28=2x+4
 -4 -4
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 24=2x
 /2 /2
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 X=12
4) Emmanuel bought 12 lbs of potting soil last week
        
             
        
        
        
I don't under stand what u asked