Answer:
 the answer is b
Step-by-step explanation:
 
        
                    
             
        
        
        
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Let l length, w width, p perimeter:
l=12+w
2(l+w)=p
2((12+w)+w)= 100
2(12+2w)=100
12+2w=50
2w=38
w=19
l=12+w=12+9= 21
l=21
        
             
        
        
        
You do 6 times one third or if there is a decimal point for it multiply it that way either one is up to you. But, when you figure out the answer to the multiplication problem be sure to multiply the answer twice by itself.