Number Line and Interval Notation

When graphing b< 6 would you use an open or closed circle?

• open

• closed

What interval notation does the number line graph represent?

• [∞, -5)

• (∞, -5)

• [-5, ∞)

• (-5, ∞)

Would you use a closed or open circle to graph x < 3?

• Closed

• Open

Write the interval notation for the graph?

• [-3, 2)

• -3<x<2

• (-∞, -3] U (2, ∞)

• x > 2 or x < -3

When writing a solution in interval notation, what brackets do i use for: > or <

• [ ]

• ( )

Write the following solution in interval notation:

z < 20

• [-∞ , 20 )

• ( 20,∞)

• ( -∞ , 20)

• ( -∞ , 20]

Write the following solution in interval notation:

x ≥ -3

• [ -3, ∞ )

• ( -3, ∞ )

• ( -∞ , -3 )

• ( -∞ , -3]

Write the following in interval notation

-7 ≤ x < 8

• (-7, 8)

• [-7, 8)

• [-7, 8]

• (-7, 8]

• (8, -7]

Express the following in Interval Notation

-8 ≤ x < 8

• [-8, 8]

• [-8,8)

• (-8, 8]

• (-8, 8)

• (8, -8]

Write the following in interval notation

• (3, -∞) U (∞, 5]

• [-∞, 3) U [5, ∞]

• (-∞, 3) U [5, ∞)

• (3, -∞] U [∞, 5]

• (3, -∞] U [5, ∞]