face: A flat surface of a three-dimensional figure.
factor: One of two or more expressions that are multiplied together to get a product.
factor tree: A diagram representing a systematic way of determining all the prime factors of a number.
factoring: To break a number into its factors.
Fahrenheit: Temperature scale in which water boils at  and freezes at  .
Fibonacci Sequence: A sequence whereby each number is the sum of the two numbers preceding it.
figure: Two dimensional shapes are often referred to as figures.
finite: Not infinite. Finite has an end.
flip: A reflection of a two dimensional shape, a mirror image of a shape.
focus: Imaginary point used in parabolas, hyperbolas, and ellipses.
FOIL: A technique for distributing two binomials. The letters FOIL stand for F irst, O uter, I nner, L ast. First means multiply the terms which occur first in each binomial, Outer means multiply the outermost terms in the product, Inner means multiply the innermost terms, and Last means multiply the terms which occur last in each binomial.
formula: An equation that states a rule or a fact.
fraction: A number used to name a part of a group or a whole. The number below the division line is the denominator, and the number above the division line is the numerator.
frequency: The number of times a particular item occurs in a data set.
frequency table: A data listing which also lists the frequencies of the data.
function: A set of ordered pairs where each first element is paired with one and only one second element and no element in either pair is without a partner.
Fundamental Theorem of Algebra: Every polynomial equation having complex coefficients and degree  has at least one complex root.
f(x): The symbol for a function; the way one reads the symbol for a function with independent variable x .
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