824 just add all the sides so 12+12+400+400=824 and in simpler form w2+l2
        
                    
             
        
        
        
Answer:
-3 
Step-by-step explanation:
you start with the parentheses -16-9 turns into -16 + (-9)
and then you try to solve everything. 
 
        
             
        
        
        
Complete Question
We can calculate EEE, the amount of euros that has the same value as DDD U.S. Dollars, using the equation
 E= 17/20 D
a) How many euros have the same value as 1 U.S. Dollar? euros 
b) How many U.S. Dollars have the same value as 1 euro? dollars
Answer:
a) 0.85 euros
b) 1.18 dollars
Step-by-step explanation:
The equation is given as:
 E= 17/20 D
a) How many euros have the same value as 1 U.S. Dollar? euros 
E = 17/20D
D = 1 dollar
Hence:
E = 17/20 × 1
E = 0.85 euros
b) How many U.S. Dollars have the same value as 1 euro? dollars
E = 17/20D
E = 1 euro
1 = 17/20D
D = 1 ÷ 17/20
D = 1 × 20/17
D = 1.1764705882 dollars
D = 1.18 dollars
 
        
             
        
        
        
You answer is -25 your welcome