Start by proving to them that the number 0.57 can be converted into a fraction . A whole number can't exactly be put in to a fraction. 0.57 can be converted to 14.25/25. This information means that 0.57 IS a rational number. Hope this convinced them!
 
        
             
        
        
        
It’s d, looks like you got it already! With ratios, just pay attention to not only the numbers but order of the words as well, so you can be sure the ratio follows the problem.
        
                    
             
        
        
        
Answer:  a: 8.25  b: 49.5
Step-by-step explanation:
 
        
             
        
        
        
Letter A is the answer because 
4y = 15 - 3x
so y = 15/4 -3x/4
        
             
        
        
        
<span>denominator is </span>number below the line in a common fraction.
Here's picture to show what is a denominator: