https://file.aiquickdraw.com/mathbot/file/17288015739012gcg17yz.jpg

The problem shown in your image is a word problem involving expressions. It reads:

**"A rack of discount CDs is on sale for $9 each. If Mario buys *n* CDs, which expression shows the total cost?"**

You are given four answer choices:
1. $ 9 - n $
2. $ n - 9 $
3. $ 9n $
4. $ n + 9 $

### Solution:
The total cost for Mario to buy *n* CDs, where each CD costs $9, can be found by multiplying the number of CDs (*n*) by the price per CD ($9). This gives the expression:

\[
\text{Total Cost} = 9n
\]

### Correct Answer:
Option 3: $ 9n $

Do you want more details or have any questions?

---

Here are 5 relative questions to expand on this concept:
1. How would the expression change if there was a discount of $2 per CD?
2. If Mario only has $45, how many CDs can he afford?
3. What would the total cost be if Mario bought 5 CDs?
4. How would you write the total cost if the price per CD was $9 plus tax?
5. What is the difference between $ 9n $ and $ n+9 $ in terms of meaning?

**Tip:** In word problems involving costs, multiplication is often used to calculate total expenses based on a unit price and quantity purchased.

A rack of discount CDs is on sale for $9 each. If Mario buys n CDs, which expression shows the total cost?

Learn how to calculate the total cost when buying CDs at $9 each. This algebraic word problem demonstrates key concepts like multiplication and expression formation. Ideal for students in Grades 6-8.

Math Problem Statement

Solution

Ask a new question for Free

By Image

Math Problem Analysis

Mathematical Concepts

Formulas

Theorems

Suitable Grade Level

Related Recommendation