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### Shedding Light on the Subject

Explore the development of a mathematical model for the decay of light passing through water.

### The Regression Line and Correlation

### To Fret or Not To Fret

Explore geometric sequences and exponential functions by considering the placement of frets on stringed instruments.

### Whelk-Come to Mathematics

Explore sets of names and create bar graphs, pictographs, glyphs, and circle graphs.

### Using an Elevator to Evaluate Signed Number Expressions

Using an Elevator to Evaluate Signed Number Expressions Using the idea of an elevator moving up and down, students will be given a small set of rules to add and subtract signed integers. The idea behind the method of adding and subtracting signed integers offered in these lesson is that the number of rules that s

### Visualizing Complex Roots of a Quadratic Equation

*“Visualizing Complex Roots of a Quadratic Equation”*by Thomas Edwards, S. Asli Özgün-Koca, and Kenneth Chelst. In this lesson students use various tools to discover the geometric relationship between complex roots of a quadratic equation and the graph of the associated quadratic function.

### Pythagoras, PVC Pipes, and Pianos

*MTLT*article,

*"Pythagoras, PVC Pipes, and Pianos"*by Danielle Divis. The lesson uses a music-related activity to engage students in using and connecting multiple representations of exponential growth.