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To simplify the expression \(-15a \div 5\):

### Step 1: Simplify the coefficients
- Divide \(-15\) by \(5\):
  \[
  -15 \div 5 = -3
  \]

### Step 2: Simplify the variable
- The variable \(a\) remains unchanged since the division does not affect it.

### Final Answer:
\[
-15a \div 5 = -3a
\]

Thus, the correct answer is **-3a**.

Would you like more details or have any questions?

### Related Questions:
1. How do you simplify expressions involving variables and coefficients?
2. How do you handle negative signs when dividing or multiplying?
3. What are the rules for dividing terms with variables?
4. How can you verify your result by multiplying back?
5. What is the difference between simplifying and solving an equation?

### Tip:
Always simplify coefficients first before dealing with variables when dividing algebraic terms!

Learn how to simplify the algebraic expression -15a ÷ 5. This problem involves basic algebra concepts such as coefficient simplification and variable management. Suitable for students in Grades 6-8.

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