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### 13 Cards in this Set

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 Variable A letter or symbol that represents a number Algebraic Expressions Numbers formed together with the operations addition, subtraction, multiplication, division, raising to powers or roots. Natural Numbers {1,2,3,4...} Any positive number higher than 0 Whole Numbers {0,1,2,3,4...} Any positive number including 0 Integers {...-4,-3,-2,-1,0,1,2,3,4...} Any number Positive AND negative Set Builder Notation Describes the members of the set but does not list them {x|x is a natural number less than 3} Roster Form Lists what is described in the Set Builder Notation {1,2} "E" or "is an element of" Symbol to show if a number is an element of a set 3E {1,2,3,4,5} Real Numbers Any point on the number line Rational Numbers a/b a and b are integers and b =/ 0 Irrational Numbers a real number but express doesnt make sense 5/0= irrational Subset Smaller group of numbers which belong to a bigger Set Absolute Value Distance on the number line Always positive