Let's begin by making sense of the given information. The given diagram shows that the mollusks usually are found between - 2500 feet and - 100 feet. If we let e represent the depth at which mollusks are found, then e must be greater than or equal to - 2500 and e must be less than or equal to - 100.
e ≥ - 2500 and e ≤ - 100
⇕ [0.5em]
-2500 ≤ e ≤ -100
To graph this compound inequality, we will place a closed circle on both - 2500 and - 100, because e can equal these values, and we will shade the region between them.
