Virtual Nerd: What's a Real Number?

Working with a zero exponent makes an expression very easy to figure out, yet it comes with some special rules. Watch this tutorial for guidance when working with a zero exponent. [7:08]

A real number is any number that you can find on a number line. This includes rational and irrational numbers, which means positive numbers, negative numbers, decimal numbers, square root numbers and even pi.

An irrational number is a number that cannot be written as a fraction. View this tutorial to see some examples and learn the definition and an important property of these special numbers. [2:06]

This tutorial provides an introduction to the number line and shows you how to graph numbers on the number line in order to compare them. [5:48]

Instructional video explores how prime numbers are defined. [1:31]

There are many different ways to solve a system of linear equations. In this tutorial, you'll see how to solve a system of linear equations by combining the equations together in order to eliminate one of the variables. Then, see how to...

Watch how exponents add when you divide the same number raised to different exponents. Reviewing the quotient of powers rule will help you on the SAT! [5:20]

Watch how exponents add when you multiply the same number raised to different exponents. Reviewing the product of powers rule will help you on the SAT! [4:30]

Do you remember what order to follow when you simplify an expression? To review for the SAT, watch this tutorial for a reminder of the order of operations. [3:18]

Find out what a set is and why it is so important to algebra. Watch this video to learn about the different kind of sets. [1:42]