[b]Learning Target: We can express the domain, range, and other intervals (increasing/ decreasing) of a function using interval notation and inequalities so that we can efficiently describe functions.[/b][br]When we’re describing functions, we often use intervals to talk about when they are increasing or decreasing and to define the domain and range. There are a few different ways to express intervals, and you will be responsible for knowing two of them: inequalities and interval notation.http://www.mathsisfun.com/sets/intervals.html For inequalities, remember [br]- > means greater than[br]- < means less than[br]- ≥ means greater than or equal to[br]- ≤ means less than or equal to[br][br]For intervals,[br]- ( ) are called parentheses or round brackets, and they mean DO NOT include the endpoints[br]- [ ] are called square brackets, and they mean DO include the endpoints[br]- both can be used together when we want to include one endpoint but not the other [br]