Answer:
X-6
Step-by-step explanation:
Represent the unknown number with a variable then introduce the minus sign
 
        
             
        
        
        
Volume of box = length x width x height = 19 x (1.7 x 12) x 6 = 19 x 20.4 x 6 = 2,325.6 cubic inches.
        
             
        
        
        
The answer is 4 because the lines mean absolute value