Question

unlike a transverse wave, a longitudinal wave travels in a direction that is parallel to the direction the particles in the medium move. when eli moves his hand back and forth, the coils in the spring toy squeeze together and pull apart horizontally. a wave of compressing and stretching then travels along the horizontal length of the spring toy. complete the sentences. the longitudinal wave that eli creates in the spring toy travels from left to right and the particles in the spring move matter move in left and right up and down

Explanation:

The problem is about the characteristics of a longitudinal wave. According to the description, in a longitudinal wave, the wave travels in a direction parallel to the movement of the particles in the medium. Eli's action makes the coils of the spring toy move horizontally (left - right). So the particles in the spring move in the same direction (left and right) as the wave's direction of travel.

Answer:

left and right