<em><u>ANSWER</u></em>
My answer is in the photo above
 
        
             
        
        
        
Remember you can do anything to an equation as long as you do it to both sides
a=age
500 reduced by 2 times a is equal to 388
500-2a=388
minus 500 both sides
-2a=-112
divide both sides by -2
a=56
you are 56
        
             
        
        
        
Step-by-step explanation:
In my opinion the reason 4 is incorrect 
 
        
                    
             
        
        
        
Method 1:
4(754)
=4(700+50+4)
=2800 + 200 + 16
=3000+16
=3016
-----------------
Method 2:
4(754)
=4(250+250+250+4)
=1000+1000+1000+16
=3016