Question

Which of the following solutions are written in set notation? Select ALL that apply. (2 points)
{x=4}
(3)
{-15}
25
{7}

Answer 1

In set notation, elements are typically enclosed in curly braces `{}`. Let's analyze each option:

1. **{x=4}** - This is set notation, as it uses curly braces.
2. **(3)** - This is not set notation; round parentheses usually denote an interval or are used for grouping.
3. **{-15}** - This is set notation, as it uses curly braces.
4. **25** - This is not set notation; it is just a number.
5. **{7}** - This is set notation, as it uses curly braces.

Thus, the solutions that are written in set notation are:

- {x=4}
- {-15}
- {7}