The moon phobos orbits mars
(mass = 6.42 x 1023 kg) at a distance
of 9.38 x 106 m. what is its period of
orbit?

is the period of orbit.

Explanation:

The equation that is useful in describing satellites motion is Newton form after Kepler's Third Law. The period of the satellite (T) and the average distance to the central body (R) are related as the following equation:

Where,

T is the period of the orbit

R is the average radius of orbit

G is gravitational constant  

Here, given data

Substitute the given values, we get T as

Taking square root, we get

i think they are all correct

explanation:

they seem good