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# Chapter 2

### Algebra I Vocabulary

Formula a rule that states the relationship between 2 or more quantities.
consecutive integers 2 or more integers in counting order (example: 4,5,6)
number theory the study of numbers and the relationship between them.
identities equations that are true for all values of the variable
absolute value the distance a number is from zero on a number line
ratio a comparison of two numbers by division
proportion an equation stating that two ratios are equal.
means the middle terms in a proportion
extremes the outer terms in a proportion
rate a ratio that compares two quantities with different units of measure
unit rate compares a certain number of one item to just one of another item
scale model a 3D reproduction that has been reduced or enlarged proportionally
percentage of change difference/original
literal equation a formula that involves several variables
unit analysis the process of carrying units throughout a computation
weighted average the sum of the product of the number of units and the value per unit divided by the sum of the number of units
mixture problems situations where two or more parts are combined into a whole
rate problems situations in which objects move at a certain speed
Created by: CLOP