The purpose of this task is to give an application arising from a real-world situation in which a quadratic equation arises, and where it is natural to use a graphical method to find an approximate solution and the quadratic formula to find an exact solution

This task provides an exploration of a quadratic equation by descriptive, numerical, graphical, and algebraic techniques. Based on its real-world applicability, teachers could use the task as a way to introduce and motivate algebraic techniques like completing the square, en route to a derivation of the quadratic formula.

In this game, test your knowledge of the branches of the U.S. government!

This page provides a basic overview of each branch of government. Included are their roles and what makes up the branch.

What new things did you learn about the Branches of Government? Take this quiz to test your knowledge!

Show that you know about the three branches of government by taking this quiz!

What are some of the new things you learned about the Branches of Government? Take this quiz to test your knowledge!

This game immerses students in the workings of our three branches of government. Players take on the roles of legislator, president and Supreme Court justice to get constitutional laws enacted. Players must juggle several bills at once while holding press conferences and town hall meetings.

Do your students like running things? The new version of Branches of Power allows them to do something that no one else can: control all three branches of the U.S. government.

In Branches of Power your students will:

Pick leaders for each branch of government
Create a presidential agenda and learn about the executive branch powers
Introduce bills and pass laws out of Congress
Apply judicial review to passed laws

The diversity of rotifers is stunning, and this program shows many different species. Planktonic rotifers have special adaptations for open water life. Nematodes (round-worms) include a number of important human parasites, seldom seen but easily found. Tree moss, leaf litter, and compost piles swarm with nematodes.

The term algae is a catchall for several evolutionary lines of photosynthetic organisms: dinoflagellates: red algae (plastids with chlorophyll A); diatoms, yellow-brown algae and brown algae (chlorophylls A and C); and green algae (chlorophylls A and B). This program explores the diversity, structure, ecological roles and modern classification of these vital primary producers.

The term algae is a catchall for several evolutionary lines of photosynthetic organisms: dinoflagellates: red algae (plastids with chlorophyll A); diatoms, yellow-brown algae and brown algae (chlorophylls A and C); and green algae (chlorophylls A and B). This program explores the diversity, structure, ecological roles and modern classification of these vital primary producers.

Phylum Annelida, the segmented worms include earthworms and aquatic worms such as Tubifex (class Oligochaeta), marine worms including Nereis and thousands of other species that live mostly in muddy ocean habitats (class Polychaeta), and leeches (class Hirudinea). Segmentation, organ systems, and similar larval development unite these diverse worms.

Phylum Annelida, the segmented worms include earthworms and aquatic worms such as Tubifex (class Oligochaeta), marine worms including Nereis and thousands of other species that live mostly in muddy ocean habitats (class Polychaeta), and leeches (class Hirudinea). Segmentation, organ systems, and similar larval development unite these diverse worms.

Arthropods are the most successful phylum in the animal kingdom. The program describes the phylum characteristics and major groups of arthropods: crustaceans (copepods, ostracods, cladocerans, amphipods, isopods, eubranchiopods, decapods, and barnacles), chelicerates (scorpions, pseudoscorpions, whipscorpions, spiders, ticks, and mites), and the uniramians, a major evolutionary branch that includes centipedes, millipedes, and insects. Throughout this program the focus is on adaptations, life cycles, and evolutionary relationships.

Arthropods are the most successful phylum in the animal kingdom. The program describes the phylum characteristics and major groups of arthropods: crustaceans (copepods, ostracods, cladocerans, amphipods, isopods, eubranchiopods, decapods, and barnacles), chelicerates (scorpions, pseudoscorpions, whipscorpions, spiders, ticks, and mites), and the uniramians, a major evolutionary branch that includes centipedes, millipedes, and insects. Throughout this program the focus is on adaptations, life cycles, and evolutionary relationships.

The surprising range of behavior seen in living bacteria, how bacteria obtain nutrients through "external digestion," and how to use sterile techniques for culturing and studying them. The program shows the vital roles bacteria play in maintaining the biosphere through oxygen production (by cyanobacteria), decomposition and nitrogen fixation.

The surprising range of behavior seen in living bacteria, how bacteria obtain nutrients through "external digestion," and how to use sterile techniques for culturing and studying them. The program shows the vital roles bacteria play in maintaining the biosphere through oxygen production (by cyanobacteria), decomposition and nitrogen fixation.

The Phylum Chordata includes tunicates, sea lancelets, hagfish, and all familiar vertebrate animals. This program explores how these seemingly diverse animals evolved and how the group is unified by four characteristic structures: a hollow dorsal nerve chord, a supportive notochord, gill slits, and a post-anal tail. Key milestones in vertebrate evolution included improvements in swimming and feeding, the evolution of paired fins and primitive lung, movement onto the land, and the role of the amniotic egg.

The Phylum Chordata includes tunicates, sea lancelets, hagfish, and all familiar vertebrate animals. This program explores how these seemingly diverse animals evolved and how the group is unified by four characteristic structures: a hollow dorsal nerve chord, a supportive notochord, gill slits, and a post-anal tail. Key milestones in vertebrate evolution included improvements in swimming and feeding, the evolution of paired fins and primitive lung, movement onto the land, and the role of the amniotic egg.