When you think about it, we use inequalities all the time. An inequality just means that something is less than a certain number. So, for example, if you get up at 6am, and you have to be to school at 8am, you have less than 2 hours to get to school. When you go to the store, and you only have $20, you have to spend less than, or up to $20. When you, or someone else is driving, and the speed limit is 40mph (Or 40 Kilometers per hour) than you have to drive less than the speed limit. So anything that has a limit, like time, money, or space (Think of an auditorium, it can only hold so many people) can be represented by and inequality!