Final answer:
The most likely units of measurement for the distance of Trey's family hike are meters or kilometers, as millimeters and centimeters are too small. The specific unit depends on whether it was a short or long hike, with meters used for shorter distances and kilometers for longer ones.
Step-by-step explanation:
The question is about determining the most appropriate unit of measurement for the distance that Trey's family went on a hike. In everyday contexts, hikes are typically measured in kilometers or meters, not in millimeters or centimeters given that these are too small to usefully measure the distances usually traversed in a hike. Therefore, when Trey's family says their hike was about 8 units in length, we are most likely talking about either meters or kilometers. If it was a short hike, we would use meters, but for a long hike, we would use kilometers.
For example, in another context, if Corey measures the distance between two trees and it is 8 meters, he may want to convert that measurement to centimeters. Here, we would multiply the number of meters by 100, because there are 100 centimeters in a meter, which would give us 800 centimeters.