Here's the question you clicked on:
SNIIX18
Which statement is true? A. Kepler’s laws apply only to the motion of Earth. B. Kepler’s laws can be used to predict eclipses. C. Kepler’s laws are true for a central force that is directly proportional to distance. D. Kepler’s laws can be deduced from Newton’s laws of motion and gravity.
did you read Kepler's law yet?
in the last post you wrote T^2=kr^3 where k is a constant...Kepler told this first ....
in this case it would be 4...