I think the answer's C: $7000/$8000
That's a surprisingly easy question for high school
        
                    
             
        
        
        
The calculated average of a data set best describes A: Mean.
        
             
        
        
        
But how many feet is he running each time?
        
                    
             
        
        
        
Answer:
$75
Step-by-step explanation:
15 x 5 = 75
trust me bro :)
 
        
             
        
        
        
Answer:
   see attached
Step-by-step explanation:
It's almost easier for you to do this than it is to post a question on Brainly. 
All you need to do is type the relevant expressions. Once you have Desmos show you the vertex, writing the x= equation for that is all that is required to draw it.