<span>DNA and proteins are packed into cellular structures known as chromosomes.</span>
        
                    
             
        
        
        
Well, this is absolute value, so as a mixed fraction you would have to times the denominator to the whole number, and then add the answer of that to the numerator (2 x 2 x 1). After that, you should get a whole number as an answer, but make it as a fraction. (put the whole number you got on top of the denominator before (2) to make it a fraction). Then, again, since it's absolute value, then it into a negative. Hope this helps and hope it not confusing!!
        
             
        
        
        
Step-by-step explanation:
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Yes, she is correct 
1/2 + 1/2 = 1 or 0.5 + 0.5 = 1 so half of a wall plus half of a wall equals one hole wall. 
That's as simple as I can put it mathematical reasoning. I hope this helps