Several factors can be responsible, including: 1  Heredity: If your dad had oily hair, chances are you will, too. 2  Hormonal fluctuations: In adult women, it may come with the menstrual cycle or using birth control pills. 3  Bulking up: Excessive oil is a side effect of using androgenic hormones to increase body mass.
At first glance, a function looks just like a relation. 1  It's a set of ordered pairs such as { (0,1) , (5, 22), (11,9) }. 2  Like a relation, a function has a domain and range made up of the x and y values of ordered pairs.
A function is a relation in which each element of the domain is paired with exactly one element of the range. So, this. relation is a function. . 62/87,21. A function is a relation in which each element of the domain is paired with exactly one element of the range. In the. domain, the value 2 is paired with 2 and Ã­4. So, this relation is not a function. . 62/87,21. This is a function because no vertical line can be drawn so that it intersects the graph more than once.