R=2K which equals 2R=4K
4(R=K+8) or 4R=4K+32
Subtract first equation from second equation.
2R=32 so R=16
Plug into first equation 
16=2K so K=8
Now plug both into second equation to check 
4R-4K=4(R-K)=4(8)=32 it works 
So Roberto is 16 and Katie is 8
(In 4 years R would be 20 and K would be 12 which has a difference of 8)
        
             
        
        
        
The answer is (1/5=0.2) (4/20=0.2)
        
             
        
        
        
you take 38 hours and multipy it by 10.50 is $399.00
 
        
             
        
        
        
Answer:
A does not represent a function
 
        
             
        
        
        
Answer:
2714 mm3
Step-by-step explanation: