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The task involves comparing three mobile phone tariffs: Easyphone, Happy-Talking, and Lucky-Handy. Based on the image, here’s a breakdown of the problem and tasks:

### Information Given:
- **Easyphone**: 
  - Monthly fee: 10€
  - Call cost: 15 cents per minute

- **Happy-Talking**: 
  - Monthly fee: 5€
  - Call cost: 25 cents per minute

- **Lucky-Handy**: 
  - No monthly fee
  - Call cost: 40 cents per minute

### Aufgaben (Tasks):
1. **Create a Value Table**:
   Create a table showing the costs for different providers and calculate monthly fees based on the usage. Give Laura a recommendation based on the results.

2. **Plot a Graph**:
   Plot the costs for each provider on a coordinate system, where the x-axis represents the call duration (minutes) and the y-axis represents the cost. Each tariff should have a different color.

3. **Read Graph for Comparison**:
   Determine from the graph when one tariff becomes cheaper than the others.

4. **Set up Cost Equations**:
   Formulate a function (equation) for each tariff.

5. **Calculate Break-Even Points**:
   Calculate the points where one tariff becomes cheaper than the other.

Would you like to start with a specific question or task from the list, such as setting up the value table or solving the equations? Let me know!

### Further Questions:
1. How many minutes does Laura plan to talk per month?
2. Should the graphs be plotted for specific minute intervals (e.g., 10, 20, 30 minutes)?
3. Would you prefer to use exact break-even points or approximate from a graph?
4. Do you need a recommendation for a specific range of call minutes?
5. Should the recommendation include the total monthly cost, including internet usage?

### Tip:
For tasks like break-even points, the intersection of cost functions will reveal when one tariff becomes cheaper than the others.

The task involves comparing three mobile phone tariffs: Easyphone, Happy-Talking, and Lucky-Handy. Based on the image, here’s a breakdown of the problem and tasks.

Explore how to compare mobile tariffs using linear functions and break-even analysis. Learn how to calculate monthly costs based on call durations and determine which tariff offers the best value at different usage levels.

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