Hi, I'm Charlie Kasov. I'm a math teacher, and today we're going to learn what parentheses you use when graphing. Now, there's two types of parentheses. Theres parentheses and then theres brackets. So, if you have this, three, six, this means that it's three is less than X, which is less than six. Meaning--X I'm just using as a variable--but, you might have a different variable that you're trying to solve for. The point is, if you have parentheses three, parentheses six, it means that X has to be between three and six. It cannot include three and six. However, if you have bracket three, six, that means that it's three is less than or equal to X, which is less than or equal to six. You can have mix and match, as well. If you have a parentheses three comma six bracket, that means three is less than X, which is less than or equal to six, or vice versa. Bracket three, six parentheses, which means that three is less than or equal to X, which is less than six. So, in closing, when you have parentheses, that means that there is no limit placed. When you have brackets, that means there is a limit. It can include the number. I'm Charlie Kasov, and you just learned what parentheses to use when graphing. Thanks a lot.