Answer: 
Center = (2,5)
Radius = 10
Choice A
To find this answer, first write the equation 
(x-2)^2 + (y-5)^2 = 100
into 
(x-2)^2 + (y-5)^2 = 10^2
Note how the second equation is in the form
(x-h)^2 + (y-k)^2 = r^2
We see that (h,k) = (2,5) is the center
and r = 10 is the radius
        
                    
             
        
        
        
40 bikes. 120 times 40 equals 4800 divided by 2 because they pay for half the bike will be 2400
        
             
        
        
        
The x-intercept is (-4/3,0).
Hope that helps!