My answer is zero but I am not sure if I am correct

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.

What is a carrier wave and how does it affect what you hear on the radio

Where should a carbon monoxide detector be mounted?