This document is a lesson on integers from an online math course. It includes examples and explanations of key concepts: - Integers include whole numbers and their opposites, and can represent elevations above and below sea level. - The opposite of a number has the same distance from 0 on the number line but on the other side. - Integers can be compared and ordered using a number line by their distance from 0. - Absolute value is the distance of a number from 0 on the number line, and is always positive or zero. Examples are used to illustrate finding opposites, comparing, ordering, and absolute values of integers.