S O S – Help When You Need It!  (The next best thing to a live tutor.)

Registration, including your real name and school e-mail address*, is required before accessing the site.  Registrations continue indefinitely, but purchased chapters are accessible only until the end of the semester.

Some resources are free and are immediately accessible.

The main body of the resources, especially the complete set of worked even-numbered problems, requires a PayPal payment of $4.97 per chapter.  The price is set so low (less than you would spend at Starbucks, and far less than two hours of a private tutor’s time) so that the resources will be available to the maximum number of students.

Use the comments or contact forms to make suggestions or requests or to point out problems or errors.  Please keep the feedback constructive.


Please note:  On rare occasions, we may need to confirm your identity or use of our materials, so registrations using “screen names” or non-school e-mail addresses will be deleted.  In such cases, no refunds will be made.