Math Problem Statement

Joey has $100 in the bank and adds $25 each week (w). He wants to keep it in the bank until he has at least $250. Select the inequality that will help Joey know how many weeks he needs to leave his money in the bank.

Solution

To help Joey determine how many weeks he needs to keep his money in the bank until it reaches at least $250, we can set up an inequality based on his starting amount and weekly additions.

Joey has:

  • $100 initially
  • Adds $25 each week (let ww represent the number of weeks)

The condition states he wants his balance to be at least $250. Therefore, we need the inequality:

100+25w250100 + 25w \geq 250

From the choices provided, the correct inequality is: 100 + 25w ≥ 250

This inequality will allow Joey to solve for ww to find out how many weeks it will take to reach or exceed $250.

Would you like further details on how to solve this inequality or have any other questions?

Here are some additional questions for exploration:

  1. How would you solve the inequality 100+25w250100 + 25w \geq 250 for ww?
  2. What would the solution mean in the context of weeks Joey needs?
  3. What if Joey wants at least $300? How would the inequality change?
  4. How would the inequality change if Joey were adding $30 per week instead?
  5. What if Joey starts with $150 instead of $100?

Tip: When solving inequalities, remember that dividing or multiplying by a negative number reverses the inequality sign.

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Math Problem Analysis

Mathematical Concepts

Algebra
Inequalities

Formulas

Starting amount + (weekly addition * weeks) ≥ desired amount

Theorems

Properties of inequalities

Suitable Grade Level

Grades 6-8