Navigation : AP CS Artificial Intelligence Intermediate CS - 3. Images - 7. Numbers - 8. Number Models - 13. Booleans - 15. Conditionals - 20. Using Structures - Sem.I Review - 21. Structures -- 21. PV Intro -- 21. Two Actions, One Tick -- Moving Ball -- Speed Typer -- Agar.io - 22a. Recursion - 22b. Lists - Sem.II Review - Typed Racket - Resources - Pro Features - Online Help Robotics WY Robotics Exploring CS (Teachers) Resources Math Soln 2 (define (h x) (g (f x))) 21. PV Intro Moving Ball