INTERVAL NOTATION

• an unshaded circle is used when the inequality has a > or < sign
• parenthesis is used when the inequality has a > or < sign
• a broken line or parabola is used when the inequality has a > or < sign
• a shaded circle is used when the inequality has a >= or <= sign
• brackets are used when the inequality has a >= or <= sign
• a whole line or parabola is used when the inequality has a >= or <= sign