Question

Write the interval notation represented by each description below:

1.
The set of all numbers less than negative ten.
2.
The set of all positive real numbers.
3.
The set of all numbers less than 4.242 and greater than 12.566.
4.
The set of all numbers that are greater than 15 and less than 50.
5.
The set of all numbers that are at most 5.
6.
The set of all numbers that are at least 18.

Thank you so much for your help!

Answer 1

1. (-∞ , -10]

2. [0, ∞ )

3. [12.566, 4.242]

4. [15, 50]

5. (-∞ , 5]

6. [18, ∞)

Explanation:

Answer 2

1. The set of all numbers less than negative ten.

• (- ∞, -10)

2. The set of all positive real numbers.

• (0, +∞)

3. The set of all numbers less than 4.242 and greater than 12.566.

• (-∞, 4.242 )∪ (12.566, +∞)

4. The set of all numbers that are greater than 15 and less than 50.

• (15, 50)

5. The set of all numbers that are at most 5.

• (-∞, 5]

6. The set of all numbers that are at least 18.

• [18, +∞)