: Official solution keys (often created by Ted Gott ) and video solutions are available to teachers who verify their identity with a school ID via email to educators like Mr. Sindel.

As a teacher, Passwater is explicit: His answer keys are intended for educators and tutors . When a student downloads his answer key without the accompanying lesson, they lose the struggle session—which is where learning happens.

: Many of Passwater's topics (e.g., Change in Tandem and Exponential Data Modeling ) have detailed video notes on YouTube that explain the logic behind the answers.