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.
Functions. 1  Identify a function. 2  Determine whether a graph is a function. 3  Identify a function from a graph.  Determine whether a set of ordered pairs represents a 1  function. Compare two functions by analyzing an equation and a graph.  Recognize the characteristics of a linear 1  function. Construct linear functions from tables.