Which is an example of an expression?
 13−−√+4.11
 2–√ + 2.1=3.5
 8–√−π=−0.3
 5.7 + 2.45=8.2

An **expression** in mathematics is a combination of numbers, variables, and operations (such as addition, subtraction, multiplication, etc.) without an equals sign.

Let's analyze the options:

1. \( \sqrt{13} + 4.11 \) - This is an **expression** since it doesn't have an equals sign.
2. \( \sqrt{2} + 2.1 = 3.5 \) - This is an **equation**, not an expression, because it includes an equals sign.
3. \( \sqrt{8} - \pi = -0.3 \) - This is also an **equation**.
4. \( 5.7 + 2.45 = 8.2 \) - This is another **equation**.

So, the correct answer is **\( \sqrt{13} + 4.11 \)**, which is an expression.

Would you like more details or have any questions?

Here are 5 related questions:
1. What is the difference between an expression and an equation?
2. Can an expression be simplified, and how?
3. What are some examples of more complex mathematical expressions?
4. How do variables fit into mathematical expressions?
5. When does an expression become an equation?

**Tip:** Remember, expressions do not have an equals sign, while equations do.

Which is an example of an expression? 13−−√+4.11, 2–√ + 2.1=3.5, 8–√−π=−0.3, 5.7 + 2.45=8.2

Learn how to differentiate between mathematical expressions and equations through examples involving square roots and constants like π. This problem is designed for students in Grades 6-8 and focuses on understanding the structure of mathematical expressions.

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