Answer:
y = 15
Step-by-step explanation:
Given: y varies directly with x, x=4 when y=20
To find:  y when x = 3
Solution:
As y varies directly as x, it means that as x increases, y also increases by the same factor.
As y varies directly with x,

Here, k is a constant
As x = 4 when y = 20, 

Put x = 3 

 
        
             
        
        
        
The graph shows the maximum residual is ...
  ◉  Data point (10, 10); Residual = 4.50_____
Apparently, this question makes no use of the line of best fit.
 
        
        
        
Answer:
The center is (5, -2) and the radius is 9/2
Step-by-step explanation:
The equation of a circle can be written by
(x-h) ^2 + (y-k)^2 = r^2
where (h,k) is the center and r is the radius
 (x-5)^{2}+(y+2)^{2} = 81/4
( (x-5)^{2}+(y- -2)^{2} = (9/2)^2
The center is (5, -2) and the radius is 9/2