This topic is in the 'Equations and Inequalities' section. When we are faced with a problem, like figuring out how many pages we need to read each day in order to finish a book in a certain time, we can use equations to help us out. Equations are really just mathematical expressions that have equal signs in them. We use our knowledge of the problem to set the equality, and we make sure that the mathematical expressions contains a variable representing whatever it is we don't know. Then we use mathematical tricks to bring that variable on one side of the equation, and knowing this process gives you the power to solve a huge amount of real world and theoretical problems. Inequalities look a lot like equations but instead of an equal sign, you have to work with an inequality symbol like >, <, ≥, or ≤. The tutorials in this section will show you a lot of examples and teach you the differences and similarities between equations and inequalities, but don't forget that real world problems are often solved because someone translated them into equations or inequalities, and then followed the steps that you are about to learn!