Number Lines and Interval Notation

Write the following in interval notation.

x ≥ 100

• (0, 100]  

• (∞, 100]

• [100, ∞)

Write the following in interval notation.

x < 8

• (8, -∞)

• (-∞, 8]

• (-∞, 8)

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

• Closed

• Open

When you graph an inequality, you use a closed dot when you use which symbols?

• ≤, ≥ 

• <, >

• ≤, <

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
 x < 8

• (8, ∞)

• (8, -∞)

• (-∞, 8)

• [-∞, 8]

Write the following in interval notation
x ≥ 100

• (0, 100]  (Real quick)

• (∞, 100]

• [100, ∞)

• (∞, 100)

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 <

• [ ]

• ( )