Dictionary
search :       browse : 
A B C D E F G H I J K L M
  N O P Q R S T U V W X Y Z
         
Description
Related Terms
Everyday Examples
Interactive Checkpoint
More Information
Challenge
How to use this dictionary
Contact
 Challenge
 Open Sentence:  A sentence that has symbols or variables representing unknown values.

Formulaic Properties: Find values of x, y, and z so that a given expression equals 18.

Does 0 = 0?: Set two equations (open sentences) equal to each other.