Socratic uses a Creative Commons License, which means that you can use any part of an answer, even a complete answer, as long as you follow these guidelines:
Basically, you can use any material you want from Socratic as long as
- Cite Socratic as the source of the material;
- Use the material for non-commercial purposes;
- In case you alter/edit the material, allow others to use it as part of the same Creative Commons License.
So yes, feel free to use any material you find on Socratic, especially for educational purposes!