"I express my answer."
Translation:Yo expreso mi respuesta.
We don't usually "express" answers in English. Without context the exact meaning is unclear.
You understand the Spanish, and that is more important, at this point, than figuring out an out-of-context English translation.
But that is my point. I want to know what the Spanish sentence means, how it would be used: Is it to simply to reply to a question or is it to give a more detailed response. When would you say it this way versus simply "Yo respondo" ?