Inequality and Interval Notations

Which of the following notations represents Closed? Select all that apply.

• ≤ and ≥

• < and >

• ( and )

• [ and ]

Which of the following notations represents OEN? Select all that apply

• ≤ and ≥

• < and >

• ( and )

• [ and ]

What is the domain of the number line?

• inequality: -9≤x<1

  set notation: [-9,1)

• inequality: -9≤x≤1

  set notation: [-9,1]

• inequality: -9<x<1

  set notation: (-9,1)

Express the following in Interval Notation
-9 < x ≤ -4

• [-9, -4]

• (-9,-4]

• [-9, -4]

• (-9,-4)

Express the following interval in Set notation:
(-7, 15]

• -7 ≤ x ≤ 15

• -7 < x ≤ 15

• -7 ≤ x < 15

• -7 < x < 15

x<6

• A

• B

• C

• D

Which graph matches the inequality

x<4

• A

• B

• C

• D

Which is true?

• When we identify the domain, an end point that is CLOSED is included.

• When we identify the domain, an end point that is CLOSED is NOT included.

Is -4 part of the domain?

• No, because -4 is an open end point.

• Yes, because -4 is an open end point.

Which of the following interval notations corresponds to this number line?