Classifying Real Numbers in Saxon Algebra 1

Which of the following is NOT a set of numbers mentioned in the introduction?

• Rational numbers

• Irrational numbers

• Complex numbers

• Counting numbers

What symbol is used to represent the intersection of two sets?

• U

• ∪

• ∩

• ∧

In the example given, which eye color is NOT included in the intersection of Grade 9 and Grade 10?

• Brown

• Green

• Hazel

• Blue

What does the union of two sets represent?

• Elements in neither set

• Elements in either set

• Elements in both sets

• Elements in the first set only

Which symbol is used to represent the union of two sets?

• ∧

• U

• ∪

• ∩

What does it mean for a set to have closure under an operation?

• The operation can be performed on any two elements of the set

• The result of the operation on any two elements of the set is also in the set

• The set contains all possible elements

• The set is finite

Which of the following sets is closed under addition?

• Irrational numbers

• Rational numbers

• Integers

• Whole numbers

What is a counterexample used for in evaluating statements about closure?

• To prove a statement true

• To prove a statement false

• To provide an example of closure

• To list all elements of a set

Which operation is NOT mentioned as an example for evaluating closure?

• Addition

• Multiplication

• Division

• Subtraction

What is the result of 5 minus 8 in terms of whole numbers?

• A whole number

• A fraction

• A negative number

• A positive number