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Answer:
-12-4=-16
Step-by-step explanation:
the distance between -12 and 14 on number line 
-12-4=-16
|-`16|=16
 
        
             
        
        
        
Width be X,  length is X+15
area of garden = x(x+15)
area of sidewalk =  x(x+15) - (x-4)(x+11) = 632
X^2 + 15X - X^2 - 7X + 44 = 632
8X = 632-44 =588
X= 73.5  >> WIDTH  and LENGTH = 88.5
HOPE IT HELPED