Question

The elliptical orbit of Mercury, whose minimum distance to the Sun is 29 million miles and whose maximum distance to the Sun is 43 million miles. According to Kepler's laws, the average distance of a planet to the Sun is equal to half the length of the orbit's major axis. The average distance of Mercury to the Sun is _____ million miles.

Write an equation that models the orbit of Mercury, if the minor axis has length 70.