## Math in the News: 8/29/11
*August 27, 2011*

*Posted by Edward Deleon in : algebra, geometry, math, media , add a comment*

In the current issue of Math in the News, we look at a simple method for developing a computer tracking system for hurricanes. Using Excel, we create a “random walk” simulation of a hurricane path.

The key idea is that a truly random walk simulation would not produce anything like a hurricane’s path. A controlled randomness is what is required and this allows us to introduce the notion of managing the random variables.

In order to end up with a path that goes in a northwesterly direction, the random number generator must favor moving up and to the left, rather than down and to the right. The latter are not, of course, excluded, but the preponderance of the movement is in the preferred direction. Furthermore, students can tweak the random variables to create a hurricane path that goes toward the Gulf of Mexico or, like Hurricane Irene, along the Eastern Seaboard.

Try this activity as a back-to-school introduction to (or refresher on) random number generation.

## Media4Math’s Library++
*August 15, 2011*

*Posted by Edward Deleon in : algebra, graphing calculators, math, media , add a comment*

Coming in 2012, Media4Math is pleased to announce the release of its online media libraries for Algebra, Geometry, and Graphing Calculators. Called Library++, this collection of multimedia resources will include lesson plans, interactive activities, video, animations, simulations, and assessment.

The Algebra Library will launch in January 2012 and will include a complete set of multimedia resources to support a full-year algebra curriculum. This will be an ideal instructional and tutorial library that will literally bring algebra to life. Classroom teachers, homeschool educators, and resource centers will all benefit from the vast resources in this library.

Launching the spring of 2012, the TI-Nspire CX Library will include a complete library of interactive lessons that use the new TI-Nspire CX graphing calculator. No other media resource will come close to providing curriculum-focused support for integrating the Nspire CX. This library also offers support for a full-year algebra course.

Finally, launching in the fall of 2012 is the Geometry Library, which is a complete multimedia resource for a full-year geometry course.

The Library++ Multimedia Solution will come at a single subscription price, depending on whether the end user is a student, teacher, school, or district. Our pricing will amaze you.

Get a preview of these libraries by clicking here. Each Library has its own tab that includes preview content.

**Also, please register at our Library++ site to stay up-to-date on the launch and other pre-release news.**

## Composite Functions Using the TI-Nspire Graphing Calculator
*August 13, 2011*

*Posted by Edward Deleon in : algebra, graphing calculators, math, media , add a comment*

We have uploaded a number of TI-Nspire videos on the topic of composite functions.

This first set deals with linear functions.

This next video deals with mapping a liner function to a quadratic.

This next video deals with mapping a liner function to a cubic function.

This next video deals with mapping a liner function to a polynomial function.

These videos deal with mapping a liner function to an exponential and a logarithmic function.

## Math in the News: 8/15/11
*August 11, 2011*

*Posted by Edward Deleon in : algebra, math, media , add a comment*

In our next issue of Math in the News, we look at the new NFL Collective Bargaining Agreement (CBA). This is a follow-up to our 6/20/11 issue, which dealt with the previous CBA.

We focus on the new minimum salary requirements. This is important, since this affects the vast majority of NFL players. While there will always be super stars earning hundreds of millions of dollars, these are by far the outliers. The average NFL player, whose career is of finite length, needs a salary structure that ensures a livelihood that extends well beyond his NFL days.

This table summarizes the minimum salary, based on the number of completed seasons (CS) for a player and the starting year.

An analysis of this data allows for an exploration of the following math concepts:

- Discrete functions
- Step functions
- Linear regression
- Quadratic regression
- Data analysis

## Math in the News: 8/8/11
*August 5, 2011*

*Posted by Edward Deleon in : algebra, math, media , add a comment*

In our next issue of Math in the News we look at federal spending. This is a timely topic, since the debt ceiling was recently increased and the levels of government spending are becoming worrisome as the national debt increases.

We look at data from the White House Office of Management and Budget (OMB), which has a wealth of data. These data sets are easily downloadable as Excel spreadsheets.

We look at the dramatic increase in spending from 2000 to 2010 and ask, What was the year-to-year percent increase in spending? Students will likely estimate huge percentage increases, and the actual result will likely surprise them.

This activity is a great example of the power of compound interest.

Update: Here we reproduce it as a SlideShare Presentation: