Purplemath Inc Careers in Chicago, IL

Purplemath, Inc is a free-access algebra-lessons web site. Purplemath's lessons were written by Elizabeth Stapel, initially for her students at Western International University, South Mountain Community College, and other Phoenix-area institutions. Ms. Stapel has created many animations which supplement the lessons and highlight and clarify difficult concepts; a particular favorite is her "hand" animation explaining how to multiply two matrices: * How to Multiply Matrices * http://www.purplemath.com/modules/mtrxmult.htm * "hand" graphic: * http://www.purplemath.com/modules/matrices/hand_ani.gif Since 1998, when Ms. Stapel created her first personal web site for her student, Purplemath has steadily grown by about 30% a year. Access to the algebra lessons remains free to site visitors, with expenses paid largely by advertising and online tutoring. The Purplemath web site contains hundreds of pages of lessons and a free homework-help forum. Some trigonometry lessons have been added, and M