Answer:
r(-2) = -5 , r(0) = -7 , r(5) = -12.
Step-by-step explanation:
 
        
             
        
        
        
The function would be f(x)=11,500-.16xPlug in 4 for x
        
             
        
        
        
45 is 75% of 60 but if you’re looking for the difference subtract 75 from 100, so 25%
        
             
        
        
        
Since the ratio is 3:4, and 12/4 is 3 than you do 3x3 and get 9 so the answer is 9:12 or 9 boys and 12 girls. To check your answer, you can do 3/4 (for 3:4) and that is 0.75. If you do that with 9:12 you also get 0.75.