Answer:
1st option
Step-by-step explanation:
4  ÷ 2
 ÷ 2  ( change mixed numbers into improper fractions )
 ( change mixed numbers into improper fractions )
=  ÷
 ÷ 
To perform the division
leave 1st fraction, change ÷ to × , turn 2nd fraction ' upside down'
=  ×
 × 
 
        
                    
             
        
        
        
Commutative property of addition
        
                    
             
        
        
        
Regroup 
2(x-7)=36 
Divide both sides by two 
X-7= 36/2
Simplify 36/2 to 18 
X-7=18
Add 7 to both sides 
X=18+7
Simplify 18+7 to 25 
X = 25
        
                    
             
        
        
        
The lenght would be 12*4 is 48
        
             
        
        
        
Answer:
1.7030973451327434
Step-by-step explanation: