Answer:
Distance formula is below
Step-by-step explanation:
The answer is 8. You rewrite the fraction as 5.25.
The equation of a circle:

(h,k) - the coordinates of the center
r - the radius
The center is (4,0), the length of the radius is 2√3.
Add the three numbers together, then divide by 3 because there are 3 numbers.
66+62+82= 210 = 70
70 is the average of these 3 numbers.
Hope this helps! :)