Which of the following solutions are written in set notation? Select ALL that apply. (2 points)

Question

{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}