Question

1. how does sound usually travel?

an object vibrates, and those vibrations travel through the air in one direction as transverse waves.
an object vibrates, and those vibrations carry air in one direction as longitudinal waves.
an object vibrates, and those vibrations carry air in all directions as transverse waves.
an object vibrates, and those vibrations travel through the air in all directions as longitudinal waves.

Explanation:

Sound is produced by vibrating objects. Sound waves are longitudinal waves, where the particles of the medium (like air) vibrate parallel to the direction of wave propagation. Also, sound travels in all directions from the source (not just one direction).

Answer:

An object vibrates, and those vibrations travel through the air in all directions as longitudinal waves.