Let's return to the topic of domains and ranges. When functions are first introduced, you'll probably have some simplistic "capabilities" and relations to deal with, often being just units of points. These won't be terribly helpful or interesting features and relations, but your textual content wants you to get the thought of what the area and range of a perform are. What are the domain and range? The area of a relation (and thus also the area of a function) is the set of allowable inputs