Unit 1, Day 8

Agenda

1. Number talk: True or False — a car’s average speed over an hour can be zero while the car is never at rest
2. Random groups: build one formula from two ideas — a secant’s slope, then the limit that shrinks it onto the point
3. Consolidate: The Derivative — the definition your boards just assembled, made official
4. Launch: The Speed Camera — one ticket, one verdict, every rate defended
5. How it is assessed: How Marks Work — reasoning is the product, and Writing About Math is how you hand it over

Things to do before our next class

• Read The Speed Camera with your partner and compute one average speed from the data — any interval you like.