We've learned about matrix addition, matrix subtraction, matrix multiplication. So you might be wondering, is there the equivalent of matrix division? And before we get into that, let me introduce some concepts to you. And then we'll see that there is something that maybe isn't exactly division, but it's analogous to it.

Sal introduces the famous and super important Pythagorean theorem! This lesson includes an introduction video followed by examples and practice problems involving finding the hypotenuse, finding a side, finding area of an isosceles triangle, and determining if a triangle is a right triangle. It is followed by a unit on Pythagorean theorem applications.

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This online exhibit explores the history and development of the electric guitar. It includes information about the instrument designers and the musicians who influenced the creation of new guitars and innovations in their sound. Examples of about 40 different guitars are included with descriptions of each. There is also information on how different types of acoustic and electric guitars operate with the sounds of each available for listening. Finally, addition information, references, and links are included.

In this activity students use log tapes and base-two slide rules as references to graph exponential functions and log functions in base-10 and base-2. Students discover that exponential and log functions are inverse, reflecting across the y = x axis as mirror images. This is activity E2 in the "Far Out Math" educator's guide. Lessons in the guide include activities in which students measure, compare quantities as orders of magnitude, become familiar with scientific notation, and develop an understanding of exponents and logarithms using examples from NASA's GLAST mission. These are skills needed to understand the very large and very small quantities characteristic of astronomical observations. Note: In 2008, the GLAST mission was renamed Fermi, for the physicist Enrico Fermi.

This lesson provides a way for students to determine the relationship between the distance from a light source and its brightness. Once students discover the relationship, they can begin to understand how astronomers use this knowledge to determine the distances to stars and far away galaxies.

Inspired by their curiosity about animals, students work together to research an animal of their choice and present the information they gather to an authentic audience.

Students will investigate different types of renewable and nonrenewable energy as they evaluating competing claims about humans' sources of power.

Students increase their media literacy skills by critically examining and revising junk mail.

This lesson focuses on torsion as a force acting upon structures. Students will have the opportunity to design something to withstand this force.

Construct an investment portfolio that includes short-, medium- and long- term investment goals.

Compare various investment vehicles.

Teacher Guide included.

2-4 hours

By observing the slicing of an apple, students become aware of the small fraction of the Earth’s limited land that is used to produce food.

In this activity, students graph second and third order functions, discovering an inverse relationship between squares and square roots and between cubes and cube roots. Students graph these functions on both linear grid (evenly spaced numbers), and a log-log grid (evenly space exponents). Graph lines that curve on linear grids transform into straight lines on the log-log grids, with slopes equal to their exponential powers. This activity is activity E3 in the "Far Out Math" educator's guide. Lessons in the guide include activities in which students measure, compare quantities as orders of magnitude, become familiar with scientific notation, and develop an understanding of exponents and logarithms using examples from NASA's GLAST mission. These are skills needed to understand the very large and very small quantities characteristic of astronomical observations. Note: In 2008, GLAST was renamed Fermi, for the physicist Enrico Fermi.

This site offers instructional activities for irregular and high frequency words. Not all words use the most common phoneme-grapheme correspondences, but most words are at least partially decodable. Many words appear so frequently in text that children need to learn them before they have been taught the necessary phoneme-grapheme correspondences. The resources on this site provide a range of options for you to teach such words.

This is lesson 4 of 4. Students will be presenting and evaluating their apps for cell phones that will provide farmers with the opportunity to learn how different irrigation methods work depending on soil type.

This lesson is part 2 of 4. After learning about the food safety continuum students will learn protocols that assist the farmer/rancher to do their part to ensure a safe and healthy food supply. This lesson covers what farm biosecurity is and the practices that make a farm safe from biological hazards.

When we hear the word radiation, it壽猻 tempting to picture huge explosions and frightening mutations. But that壽猻 not the full story 壽� radiation also applies to rainbows and a doctor examining an X-ray. So what is it, really, and how much should we worry about its effects? Matt Anticole describes the different types of radiation.Lect

What makes a superhero super? By comparing popular culture superheroes with heroic characters in childrenŐs literature, students learn to think critically about character traits, and consider how cultural perspectives influence the kinds of heroes we choose.