Help Why wouldn’t you use Astronomical Unit (AU) to measure the distance between the Earth and the Moon?

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?

If you divide a speed in miles per minute by 60, you get the same speed expressed in miles