**Mary Jane Sterling *is the author of Algebra I For Dummies, Pre-Calculus Workbook For Dummies, Algebra II For Dummies *, and oodles of other Dummies titles. She was a Professor of Mathematics at Bradley University in Peoria, Illinois, for more than 35 years, teaching algebra, business calculus, ge...

**Mary Jane Sterling *is the author of Algebra I For Dummies, Pre-Calculus Workbook For Dummies, Algebra II For Dummies *, and oodles of other Dummies titles. She was a Professor of Mathematics at Bradley University in Peoria, Illinois, for more than 35 years, teaching algebra, business calculus, geometry, and finite mathematics.