Blackhawk Vector Problem

A Nebraska National Guard helicopter maneuvers Saturday morning to place sandbags near a city of Lincoln well on an island of the flood-ravaged Platte River. State of Nebraska, Courtesy photo I avoided making a nuisance of myself by not driving out to see the 2019 Nebraska floods devastation personally. However, I have spent [...]

By | 2019-03-20T19:38:11+00:00 March 20th, 2019|PreCalculus|0 Comments

Looking for Patterns (Arithmetic Sequences and Finite Differences)

I bought and read Jo Boaler's "What's Math Got To Do With It?" last summer. She really gave me food for thought regarding grouping by ability and gender differences. I also read "Mathematical Mindsets" this fall. As a high school math teacher, I set a goal to make my teaching more visual, delve into the [...]

By | 2018-12-02T21:30:48+00:00 December 2nd, 2018|PreCalculus|0 Comments

Foci of Parabolas Exploration

You have to love the Internet and the inspiration you get from other teachers. I put together an investigation based on the tweet below.   Inspired by a session at #T3IC last year, we used lasers to find "mystery points" (foci) of parabolas based on their lines of reflection. The conversations turned to satellites, flashlights, [...]

By | 2018-03-25T20:31:58+00:00 March 25th, 2018|Algebra II, PreCalculus|0 Comments

Marginless Domain and Range Cards

I was intrigued by Sarah Carter's Domain and Range Cards on her Math=Love blog. I was afraid I would lose a lot of time having my students cut out the cards, so I made border-less cards with functions my Pre-Calculus students will see throughout the year. Pages 1 and 2 are the framework for the [...]

By | 2017-11-13T22:01:53+00:00 October 23rd, 2017|Algebra II, PreCalculus|0 Comments

Polar Coordinates and Graphs

I remember being frightened by the polar coordinate system and graphing equations using it when I was in my students' seats many years ago. With graphing calculators, this doesn't have to be intimidating. I started the unit with an introduction to the polar coordinate system and reminded my students about how intimately familiar they are [...]

By | 2019-02-07T20:50:54+00:00 April 9th, 2017|Graphing Calculator, PreCalculus|0 Comments