Answer is i 
also if you have more of these problems use (socratic) it works wonders!
        
             
        
        
        
Notice that both A and B are multiplied by (1/2).
Thus, the given expression can be re-written as [(1/2)(A+B)]^2.
Square the (1/2) and the (A+B) separately, and then multiply together the resulting squares:
(1/4)(A^2 + 2AB + B^2)
        
                    
             
        
        
        
Answer:
X= 5.52
Step-by-step explanation:
1. Solve the equation:
 e×2x + 12= 42
 x=15/e
2. Round x=15/e to the required place 
 x=5.52
 
        
             
        
        
        
7= 16 lb >16 Oz 16x16=256
8= 1500 lb < 2T 2000+2000
9= 3T>5999 lb 2000x3
10= 1600 Oz > 10 lb 1600÷16=100
11= 19 lb>300 Oz 19x16=304oz
12= 8 oz= 1/2 lb 16 ounces = 1 pound 1/2=8
13= pounds=6000 tons= 1, 1.5