Encyclopedia > National parks (United States)

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National parks (United States)

Maintained by the United States National Park Service:

Table of contents

National Parks

National Monuments

National Historical Parks, Memorials, and Battlefields

National Recreation Areas, Seashores and Trails

Other Preserves and Protected Areas



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Quadratic formula

... \sqrt {b^2-4ac}}{2a} </math> The term b2 – 4ac is called the discriminant of the quadratic equation, because it discriminates between three qualitatively ...

 
 
 
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