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Let's go through the questions one by one and solve them:

1. **Mass Conversion Question**:  
   An object has a mass of 1 kilogram. Which of the following statements indicates the correct mass of the object in grams?  
   - 1 kilogram = 1000 grams = \( 1 \times 10^3 \) grams.  
   So, the correct answer is:  
   **The object has a mass of 1 × 10^3 grams.**

2. **Length Comparison Question**:  
   Which of the following is the longest length?  
   Let's convert all options to meters:
   - 1 meter = 1 meter.
   - \( 10^2 \) centimeters = 100 centimeters = 1 meter.
   - \( 10^4 \) millimeters = 10,000 millimeters = 10 meters.
   So, the correct answer is:  
   **10^4 millimeters.**

3. **Conversion from Meters to Feet**:  
   Convert 7.3 meters to feet using the conversion \( 1 \text{ m} = 3.281 \text{ ft} \).  
   \( 7.3 \text{ m} \times 3.281 \text{ ft/m} = 23.9763 \text{ ft} \approx 24 \text{ feet}. \)  
   So, the correct answer is:  
   **24 feet.**

4. **Marathon Distance in Kilometers**:  
   The Boston Marathon distance is 26 miles and 385 yards. Let's convert this to kilometers:
   - 1 mile = 1.60934 kilometers, so 26 miles = \( 26 \times 1.60934 = 41.843 \) kilometers.
   - 385 yards = \( 385 \times 0.0009144 = 0.352 \) kilometers.
   - Total distance = \( 41.843 + 0.352 = 42.195 \) kilometers.  
   So, the correct answer is:  
   **42.195 km.**

If you need more details or have any questions, feel free to ask!

Here are some related questions:
1. What is the relationship between grams and kilograms?
2. How can you convert centimeters to meters?
3. What other units can be used to measure length besides meters, centimeters, and millimeters?
4. Why do you multiply when converting between different units?
5. Can you explain how to convert yards to meters?

**Tip**: Always remember that 1 kilometer equals 1000 meters when converting between units!

An object has a mass of one kilogram. Which of the following statements indicates the correct mass of the object in grams? Which of the following is the longest length? Convert 7.3 m to feet. First run in 1897, the Boston Marathon is the oldest annual marathon in the world. Express this distance in kilometers.

Practice solving math problems involving unit conversions. Learn how to convert kilograms to grams, meters to feet, and marathon distances to kilometers. This set of problems is suitable for students in Grades 6-8.

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