Interval & Set Notations

Write the following in interval notation
x ≥ 100

• (0, 100]
• (∞, 100]
• [100, ∞)
• (∞, 100)

What interval notation does the number line graph represent?

• [∞, -5)
• (∞, -5)
• [-5, ∞)
• (-5, ∞)

What interval notation does the number line graph represent?

• [-∞,∞)
• (∞, -∞)
• (-∞, ∞]
• (-∞, ∞)

What set notation does the number line graph represent?

• {x| x ≥-5 }
• {x| -5 ≥ x }
• {x| -5 ≥∞}
• {x| -5 ≤ x < ∞ }

What set notation does the number line graph represent?

• {x| x is all real numbers }
• { }
• {x| is all whole numbers}
• {x| is all rational numbers }

Write the inequality in interval notation
 x > -1

• (-∞, -1)
• (-1, ∞]
• (-∞, -1]
• (-1, ∞) 

Write the interval notation as an inequality.
(-∞, 5]

• x > 5
• x ≥ 5
• x < 5
• x ≤ 5

What inequality does the number line graph represent?

• x ≥ 3
• x > 3
• x < -3
• x ≤ -3

Can you use the symbols [ or ]
with infinity?

• Yes
• No
• Sometimes

What inequality does the number line graph represent

• x ≤ 4
• x ≥ -4
• x < -4
• x < 4