Answer:
here is your answer 
Step-by-step explanation:
 here is your answer 
 
        
             
        
        
        
Step 1: Circle the place value of the digit to be rounded. This is the rounding digit. Step 2: Look to the neighboring digit on the right. Step 3: a) If the neighboring digit is less than five (0 - 4), keep the rounding digit the same.
        
             
        
        
        
F(f-1x)   will be equal to x
take a simple example 
f(x) = 2x
so x = f(x) / 2
 f-1(x) = x/2
f(f-1x) =  2 ( x/2)  = 2 * x/2 = x
        
                    
             
        
        
        
8 x ¾ is the same as adding ¾ + ¾ + ¾ + ¾ + ¾ 
because, when you are adding 3/4 
8 times, you are 3/4 plus itself, 
eight times,
so you are doing 3/4*8
 
        
                    
             
        
        
        
2,320,502 <=== Two million, three-hundred and twenty thousand five hundred and two