AP Precalculus notes and worksheets for 1-01 Change in Tandem, the first lesson according to the AP Precalculus Course and Exam Description from AP Central, including pdfs and editable PowerPoint files of notes with answers (for the teacher) and notes with blanks (for the students), and pdfs and editable documents of worksheets with answers (for the teacher) and worksheets with blanks (for the students).