Newton’s law of universal gravitation a. is equivalent to kepler’s first law of planetary motion. b. can be used to derive kepler’s third law of planetary motion. c. can be used to disprove kepler’s laws of planetary motion. d. does not apply to kepler’s laws of planetary motion.

Answer;

b. can be used to derive Kepler’s third law of planetary motion.

Newton’s law of universal gravitation can be used to derive Kepler’s third law of planetary motion.

Explanation;

Kepler's three laws of planetary motion states that;

All planets move about the Sun in elliptical orbits, having the Sun as one of the foci. A radius vector joining any planet to the Sun sweeps out equal areas in equal lengths of time.The squares of the sidereal periods of the planets are directly proportional to the cubes of their mean distances from the Sun

Newton's law of universal gravitation states that every particle attracts every other particle in the universe with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

Newton’s law of universal gravitation can be used to derive Kepler’s third law of planetary motion.

The independent variable would be the fertilizer as it is what the dependent variable (the growth of grass) depends on.

It is either a  proton or a neutron im almost positive. hope this .