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The task consists of two parts:

### Part a: Identify the quadrants for each given point
We need to determine which quadrant each of the following points belongs to based on their coordinates:
1. **A(3.5 | 4)**  
2. **B(1.2 | -5)**  
3. **C(-0.2 | 1.5)**  
4. **D(1 | 2.5)**  
5. **E(-6 | -5.6)**  
6. **F(-3 | 4)**  
7. **G(2 | 1.94)**  
8. **H(-1 | -7.1)**  
9. **I(6.5 | -1.8)**  
10. **J(-3 | 6.8)**  

#### Quadrant rules:
- **Quadrant I**: \( x > 0 \) and \( y > 0 \)
- **Quadrant II**: \( x < 0 \) and \( y > 0 \)
- **Quadrant III**: \( x < 0 \) and \( y < 0 \)
- **Quadrant IV**: \( x > 0 \) and \( y < 0 \)

### Part b: Table filling
The table is asking for the sign of \(x\)-coordinates and \(y\)-coordinates in each quadrant. The signs are as follows:
- **I Quadrant**: \(x\)-coordinate is positive, \(y\)-coordinate is positive.
- **II Quadrant**: \(x\)-coordinate is negative, \(y\)-coordinate is positive.
- **III Quadrant**: \(x\)-coordinate is negative, \(y\)-coordinate is negative.
- **IV Quadrant**: \(x\)-coordinate is positive, \(y\)-coordinate is negative.

Let me proceed by calculating and listing which points belong to which quadrants.Here are the quadrants for each of the points based on their coordinates:

1. **A(3.5 | 4)**: I Quadrant  
2. **B(1.2 | -5)**: IV Quadrant  
3. **C(-0.2 | 1.5)**: II Quadrant  
4. **D(1 | 2.5)**: I Quadrant  
5. **E(-6 | -5.6)**: III Quadrant  
6. **F(-3 | 4)**: II Quadrant  
7. **G(2 | 1.94)**: I Quadrant  
8. **H(-1 | -7.1)**: III Quadrant  
9. **I(6.5 | -1.8)**: IV Quadrant  
10. **J(-3 | 6.8)**: II Quadrant  

### Part b: Table for the signs of coordinates in each quadrant

| Quadrant    | \(x\)-coordinate | \(y\)-coordinate |
|-------------|------------------|------------------|
| I Quadrant  | positive          | positive         |
| II Quadrant | negative          | positive         |
| III Quadrant| negative          | negative         |
| IV Quadrant | positive          | negative         |

Let me know if you want further details or explanations.

Here are five related questions you could consider:
1. What happens to the sign of coordinates on the axes themselves?
2. How would this change if we considered points in a 3D coordinate system?
3. How do rational and irrational numbers play a role in the coordinate system?
4. What types of transformations can move points between quadrants?
5. Can two points from different quadrants be connected by a straight line that stays entirely in one quadrant?

**Tip:** Understanding the signs of coordinates helps in graphing and solving geometric problems efficiently.

This solution explains how to identify the quadrants for points based on their x and y coordinates, along with classifying the signs of coordinates in each quadrant. Suitable for students in Grades 6-8 studying coordinate geometry.

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