algebra: The branch of mathematics that deals with operations on sets of numbers and relationships between them

equation: A statement that describes the equality of two expressions by connecting them with an equals sign

function: A kind of relation in which one variable uniquely determines the value of another variable

linear: an equation that describes a straight line

coefficient: Number used to multiply a variable

factor: Number you multiply by to get another number

variable: A symbol that represents an unknown value

scale: The spacing of numbers on the axes of a graph

units of measurement: A quantity used as a standard of measurement. (Example: Units of time are second, minute, hour, day, week, month, year and decade.)

unit rates: The rate of one item. (Example: 1 foot = 12 inches)

modeling: Using a picture, equation, or system of equations to represent real-world phenomena. Models also represent patterns found in graphs and/or data. Usually models are not exact matches the objects or behavior they represent. A good model should capture the essential character of whatever is being modeled

quantity: The amount of something

proportion: The result of dividing one number or expression by another. Sometimes a ratio is written as a proportion, such as 3:2 (three to two). More often, though, ratios are simplified according to the standard rules for simplifying fractions or rational expressions

precision: The level of detail in a number or estimate. A precise number has many significant digits. Note: An answer may be precise without being accurate. (Example: Numerous shots at a bulls eye being in the same area (not necessarily near the bulls eye).)

accuracy: How close an approximation is to an actual value. (Example: Numerous shots at a bulls eye being near the center of the bulls eye but not necessarily around each other.)