Writing and Evaluating Algebraic Expressions

🔹 What Is It?

To write means to turn words into expressions.
To evaluate means to plug in a number and solve it.

🧩 Clue to Remember

"Twice a number" → 2 × n
"Add five to a number" → n + 5

🔹 Example

If n = 4, then
2 × n + 3 = 2 × 4 + 3 = 8 + 3 = 11

💡 Why It Matters

This helps us turn real situations into math — like cost, time, and distance problems.