Question 918045
This is the concept and method:


<a href="http://www.algebra.com/my/Mixtures%3A-All-in-Symbols.lesson?content_action=show_dev">http://www.algebra.com/my/Mixtures%3A-All-in-Symbols.lesson?content_action=show_dev</a>
http://www.algebra.com/my/Mixtures%3A-All-in-Symbols.lesson?content_action=show_dev