The answer would be A. I just did this yesterday. Do you want the steps?
        
                    
             
        
        
        

Actually Welcome to the Concept of the Differential Calculus.
Since, we know this is a definite calculus, 
thus we get here as, by using the Chain Rule.
 
        
             
        
        
        
<h2>B. 28 WALA KANG JOWA AKO RIN SANA ALL MY JOWA</h2>
        
             
        
        
        
Answer:
Let a be the width and b the length
a+3=b
a*b=54
a(a+3)=54
a^2+3a-54=0
a=6
 
        
             
        
        
        
Answer:
14÷2=7 
7 is your answer. hope this helps