Answer:
 the rate at which the distance between the planes is changing is 825 each hour
Step-by-step explanation:
The computation of the rate at which the distance between the planes is changing is shown below
= Travelling one plane + travelling another plane
= 450 mph + 375 mph 
= 825 mi each hour
Therefore the rate at which the distance between the planes is changing is 825  each hour
We simply applied the above formula so that the correct value could come
And, the same is to be considered 
 
        
             
        
        
        
Answer:
x-y+16
Step-by-step explanation:
add the like terms, 6 and 10 which is 16. since the variables are not like terms, thats your final answer. hope it helped :)
 
        
             
        
        
        
Answer:
519.99(.0825) = 42.899
519.99 + 42.899 = $562.89
Step-by-step explanation:
 
        
             
        
        
        
Elga is 20 years old and Alvin would be 5. Hope this helped.
        
             
        
        
        
Step-by-step explanation:
9x - 2x = 8 + 5
7x = 13
x =13÷7
x = 1.8571
approximately = 1.86
I think this is it