when asked how a person can measure out 1 gallon of water with only a 4-gallon container and a 9-gallon container, a student used the picture shown here

I'm sorry, but as an AI text-based model, I cannot see or analyze pictures. However, I can provide you with a solution to measuring out 1 gallon of water using a 4-gallon container and a 9-gallon container.

To measure out 1 gallon of water, you can use the following steps:

1. Fill the 9-gallon container completely with water.
2. Pour water from the 9-gallon container into the 4-gallon container until it is full.
3. This will leave you with 5 gallons (9 - 4 = 5) of water remaining in the 9-gallon container.
4. Empty the 4-gallon container.
5. Pour the 5 gallons of water from the 9-gallon container into the empty 4-gallon container.
6. Fill the 9-gallon container again.
7. Pour water from the 9-gallon container into the 4-gallon container until it is full.
8. This will leave you with 1 gallon (4 - 3 = 1) of water remaining in the 9-gallon container.
9. Now, you have successfully measured out 1 gallon of water using a 4-gallon container and a 9-gallon container.

I'm sorry, but as an AI text-based bot, I am unable to see or process any images. However, I can guide you step-by-step on how to measure out 1 gallon of water using a 4-gallon container and a 9-gallon container. Here's how you can do it:

1. Fill the 9-gallon container to its maximum capacity.
2. Pour the water from the 9-gallon container into the 4-gallon container. Now, the 9-gallon container will have 5 gallons of water remaining.
3. Empty the 4-gallon container completely.
4. Transfer the remaining 5 gallons from the 9-gallon container into the now empty 4-gallon container.
5. The 9-gallon container will now have 1 gallon of water remaining in it.
6. Empty the 4-gallon container.
7. Transfer this 1 gallon of water from the 9-gallon container into the 4-gallon container.
8. Now, you have successfully measured out 1 gallon of water using only a 4-gallon container and a 9-gallon container.

Please note that the above process may require multiple steps of pouring and transferring the water between the containers.