Products and Session Packages The Quintuple (5 one-hour sessions) $210.00 The Decuple (10 one-hour sessions) $400.00 The Quindecuple (15 one-hour sessions) $570.00 The Vigintuple (20 one-hour sessions) $720.00 Rivalry Tee • Hand‑Drawn Math Art • Curved Text Design • STEM Humor Gift $27.00 Rivalry Tee with Hand‑Drawn Math Art • Clever Gift for Fans & Educators $27.00 Derivatives of Sine and Cosine Shirt $34.95
