Answer:
4583 Million is
4583 x 106
or
4,583,000,000
(8,1) since the midpoint is 3 away from the endpoint, it must also be 3 away from the other endpoint
To find the diameter of a circle, using only the circumference, you need to divide the circumference by π, or 3.14.
So in this case, you must divide 12 by 3.14, which gives you 3.82.
I even double checked this, and should be correct then.