Exploring Interval Notation Concepts

What is interval notation used for?

• To graph functions

• To find the roots of polynomials

• To write inequalities in a different format

• To solve equations

What do square brackets in interval notation signify?

• None of the above

• Excluding the number

• Including the number

• Both including and excluding the number

What do curved parentheses in interval notation signify?

• None of the above

• Including the number

• Excluding the number

• Both including and excluding the number

How do you write 'X is less than or equal to 4' in interval notation?

• (4, ∞)

• [4, ∞)

• (-∞, 4)

• (-∞, 4]

Why do we use curved parentheses for infinity in interval notation?

• Because infinity is a concept, not a number

• Because infinity is always included

• Because infinity is always excluded

• Because it looks better

How do you write 'X is greater than 5' in interval notation?

• [5, ∞)

• (5, ∞)

• (5, ∞]

• [5, ∞]

What does an open circle on a number line represent?

• None of the above

• Both including and excluding the number

• Excluding the number

• Including the number

What does a closed circle on a number line represent?

• None of the above

• Both including and excluding the number

• Excluding the number

• Including the number

How do you write '2 is less than X which is less than or equal to 5' in interval notation?

• (2, 5)

• [2, 5]

• [2, 5)

• (2, 5]

What type of statement is '2 is less than X which is less than or equal to 5'?

• Not statement

• And statement

• Or statement

• If statement