A moon orbits a planet at a distance of 2.39 million km. The moon's orbital period about the planet is 10.0 days. What is the mass of the planet? [Assume that the moon's mass is negligible compared with that of the planet, and use keplers 3rd law]

A moon orbits a planet at a distance of 2.39 million km. The moon’s orbital period about the planet is 10.0 days. What is the mass of the planet? [Assume that the moon’s mass is negligible compared with that of the planet, and use keplers 3rd law]