BASIC ALGEBRA GLOSSARY
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Title  Description  

HalfLife  When some entity experiences exponential decay (reduction or diminution) the times it takes to lose half of its size (or strength) is its HalfLife. 

Height  Altitude. How tall something is, measured in some perpendicular fashion to the "bottom" is its height. 

Hexahedron  A sixfaced polyhedron is termed a Hexahedron. 

High Quartile  The 75th percentile. Also upper quartile. 

High Quintile  The 80th percentile; upper quintile. 

Horizontal  Horizontal comes from orientation like the horizon; parallel to the "flat" surface of the earth; perpendicular to vertical. 

Hypotenuse  The longest side of a right triangle is the Hypotenuse; it is always opposite the 90degree angle (or right vertex). 

Hypothesis  In a biconditional statement the hypothesis is followed by a conclusion. In the scientific method, the hypothesis is the conjecture to be proved or disproved. 
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