[Free Registration/Login may be required to access all resource tools.] Provides resources for working with 2 x 2 matrices as transformations of the plane, and interpreting the absolute value of the determinant in terms of area.

[Free Registration/Login may be required to access all resource tools.] Presents methods for solving electrical circuit problems where there is a combination of series and parallel circuit features.

[Free Registration/Login may be required to access all resource tools.] In this lesson, students learn about parallel circuit design, and how to calculate equivalent resistance from resistors in a parallel circuit.

[Free Registration/Login may be required to access all resource tools.] In this lesson, students learn about series circuit design, and the role of resistors in maintaining the integrity of a circuit.

[Free Registration/Login may be required to access all resource tools.] In this lesson, students learn how to draw ray diagrams and to solve problems for concave and convex mirrors.

[Free Registration/Login may be required to access all resource tools.] Explains Coulomb's Law and how to use it to solve problems.

[Free Registration/Login may be required to access all resource tools.] Covers metamorphic rocks, which form from previous rocks exposed to heat and/or pressure.

[Free Registration/Login may be required to access all resource tools.] Discusses immunity and the differences between active and passive immunity.

[Free Registration/Login may be required to access all resource tools.] Defines and describes red blood cells and white blood cells, and describes the roles of platelets.

[Free Registration/Login may be required to access all resource tools.] Explains the body's first line of defense against pathogens, such as the skin and body fluids.

[Free Registration/Login may be required to access all resource tools.] Discover how scientists learn about Earth's interior using seismic waves, meteorites, density, and the magnetic field. Additional resources are available for download.

[Free Registration/Login may be required to access all resource tools.] Presents the way geothermal energy is harnessed and some of its benefits and costs. Downloadable resources are also available.

[Free Registration/Login may be required to access all resource tools.] Overview of the male reproductive structures and their functions.

[Free Registration/Login may be required to access all resource tools.] Introduces the skeletal system by discussing the structure and function of bones.

[Free Registration/Login may be required to access all resource tools.] Discusses the process of respiration and how it differs from cellular respiration.

[Free Registration/Login may be required to access all resource tools.] Resources for teaching and applying the Fundamental Theorem of Algebra.

[Free Registration/Login may be required to access all resource tools.] Learn how to graph lines using slope-intercept form.

[Free Registration/Login may be required to access all resource tools.] Covers the role of the lymphatic system in the immune response.

[Free Registration/Login may be required to access all resource tools.] Introduces cells, tissues, organs, and organ systems in the human body.

[Free Registration/Login may be required to access all resource tools.] Looks at how environmental factors put limits on population sizes.

[Free Registration/Login may be required to access all resource tools.] Looks at how the overuse of groundwater can lead to problems.

[Free Registration/Login may be required to access all resource tools.] Explores some of the factors that affect the cost of resources, such as availability, ease of extraction, and politics.

[Free Registration/Login Required] Use the interactive diagram to solve a projectile motion problem. After the activity, answer a challenge question to check for understanding.

[Free Registration/Login Required] Using the average acceleration formula, calculate the velocity of a falling ball, and then check your answer by dragging the point along the line in the given graph. After the activity, answer one...