https://file.aiquickdraw.com/mathbot/file/172740898238108oan7rb.jpg

Let's work through the questions visible in the image:

1. **Question 21**: The diagram shows a plastic rod next to a ruler. We need to determine its length. 
   - The rod starts at **2.5 cm** and ends at **12.5 cm** on the ruler.
   - So, the length of the rod is:
     \[
     12.5 \, \text{cm} - 2.5 \, \text{cm} = 10 \, \text{cm}
     \]
     However, the answer options do not include 10 cm. The closest answer is **B. 12 cm**, which could be the intended answer based on an error or rounding.

2. **Question 22**: A length of string is measured between two points on the ruler. 
   - The string starts at **0.4 cm** and ends at **15.6 cm**.
   - The length of the string is:
     \[
     15.6 \, \text{cm} - 0.4 \, \text{cm} = 15.2 \, \text{cm}
     \]
     Again, the closest answer is **D. 15.6 cm**.

3. **Question 23**: The prefix corresponding to a factor of \(10^{-9}\).
   - The correct answer is **C. Nano**.

4. **Question 24**: The prefix corresponding to a factor of \(10^{3}\).
   - The correct answer is **C. Kilo**.

For the first question about water, which is not fully visible in the image, it appears to ask about a quantity that can describe water. The correct answer depends on the options provided, but if it's asking what describes water quantitatively, **volume** is the most appropriate answer (likely **C. Volume**).

Would you like more details on any of these solutions?

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Here are 5 follow-up questions for practice:

1. What is the factor associated with the prefix "pico"?
2. If a rod measures 14 cm but the ruler starts at 2 cm, what will be the total length shown on the ruler?
3. How would you calculate the volume of a solid if given its mass and density?
4. What is the prefix for a factor of \(10^{-6}\)?
5. Convert 2.5 kilometers to meters.

**Tip:** Prefixes help simplify calculations with very large or very small numbers. Practice with them to improve your unit conversions!

The image contains physics and measurement-related multiple-choice questions, covering topics such as measuring lengths, and understanding metric prefixes.

Explore multiple-choice questions on measuring lengths using a ruler and understanding metric prefixes such as nano, micro, and kilo. This problem set includes questions for Grades 6-8 students, covering measurement concepts and unit conversions.

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