Answer:

Step-by-step explanation:
Consider the given differential equation is



Taking all variables on right sides.


Let as assume,
 and
 and 
Find partial derivatives  and
 and 
 and
 and 
Since  , therefore the given differential equation is exact.
, therefore the given differential equation is exact.
The solution of the exact differential equation is






 
        
             
        
        
        
IF BREADTH=b meters
THEN LENGTH=4 meter less than 3 times than the breadth of the hall.
LENGTH=3b-4 meters
the length of the rectangular hall is=3b-4 meters
        
             
        
        
        
The answer is D) 3,404
By putting the table values into the progam DESMOS, and then putting in the formula, the answer will be given- and that answer is 3,404. 
        
                    
             
        
        
        
Answer:
From the above we can roughly for an equation which is:
58.50 = Bill - (10% x Bill) 
58.5 = Bill - (1/10 x Bill) 
58.5 = 9/10 x Bill (Divide both sides by 9/10) 
We get:
Bill = 58.5 / (9/10)
Bill = 65
Original bill is $65.