Which sentence shows correct subject-verb agreement?
there's a good answer to that question.
there're a good answer to that question.

The first sentence.

This is because "There's" means "there is" which makes more sense than putting "There're" because that would mean "there are".

Hope this helps :)

The first one is correct. The second one wouldn’t make as much sense. “There are a good answer to that question” is a grammatical error.

needs an explanation