BASIC ALGEBRA GLOSSARY
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Title  Description  

Decimal  Digits to the left of the decimal point represent Integer Values. Digits to the right of the decimal point represent Decimal Fractions. All place values whether to the left or the right of the decimal point are successive powers of 10. The term decimal comes from the latin decimus which means tenth. In common language, base 10 numbers with digits to the right of the decimal point are considered decimal values. 

Decimal Fraction  Most simply, decimal fractions are the digits to the right of the decimal point.  
Decreasing  Decreasing means to lessen in extent or scope, to be reduced. A function is considered to be Decreasing if the values in the range decrease as the values from the domain increase. 

Degree (Polynomial)  The Degree of a polynomial is the order, or highest power (term) of the polynomial.  
Delta  Delta is the fourth letter of the Greek alphabet. Uppercase Delta looks like a triangle and is used to mean "the change in..." 

Denominator  The Denominator of a fraction is the number on the bottom; it is the divisor of the numerator.  
Dependent Variable  If y = f(x), then y is a function of x and y is the Dependent Variable. Think of it this way: whatever we get for output "y" depends on the input "x" we grab from the domain of the function. 

Direct Proportion  When variables are in Direct Proportion to one another they have the relation that as one variable grows the other either increases or decreases by a constant multiplication factor. When y = kx, we say the variables are in Direct Proportion. 

Direct Variation  Also direct proportion, Direct Variation describes the relation y = kx.  
Discriminant  In the Quadratic Formula, the radicand (the business inside the squareroot sign) is the Discriminant. In general, a Discriminant provides algebraic information about the roots of polynomials. 

Distance  A length from one point to another is considered a Distance. Any measurement in one dimension confers a length, which is Distance. 

Distance Formula  The familiar Distance Formula in Cartesian (rectangular) coordinates is a version of the Pythagorean Theorem, where the sum of the squares of the legs of a right triangle is equal to the square of the hypotenuse.  
Distributive Property  The familiar Distance Formula in Cartesian (rectangular) coordinates is a version of the Pythagorean Theorem, where the sum of the squares of the legs of a right triangle is equal to the square of the hypotenuse.  
Division  The process of finding a quotient or a ratio. One of the four basic operations of arithmetic, division begins with a dividend that is to be divided by, or segmented into parts, by a divisor. The result of dividing the dividend by the divisor is called the quotient. 

Domain  The values that are "legal" and "legitimate" to put into a function are the elements of the Domain of that function. When y = f(x), the legitimate values of x are the Domain of the function. 

Doubling Time  The time it takes an exponential or geometric growth to double in size (grow by 100 percent of the original value) is its doubling time. 
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