(1 point) One of Kepler's three laws of planetary motion states that the square of the period, P, of a body orbiting the sun is proportional to the cube of its average distance, d, from the sun. The Earth has a period of 365 days and its distance from the sun is approximately 93, 000, 000 miles. (a) Find P as a function of d. P(d) = help (formulas) (b) The planet Mars has an average distance from the sun of 142, 000, 000 miles. How many earth days are in a Mars year -- in other words, what is the period of the planet Mars? days (Round to nearest day and do not enter commas in your answer.) help (numbers)