As long as she has done her best then that should be enough. If she can't do a particular question or type of question then that will flag up a gap in her understanding to the teacher. If you work out answer for her then it won't. If you are worried just put a note with homework saying dd tries v hard but couldn't work out how to do question x.
Are you sure it's asking about the positioning of the logos and not why they've been used at all?
If it's positioning, it might be positioning in the centre, positioning next to the connected text, positioning surrounded by the connected text.
If, on the other hand, it's asking why the logos have been used, then you need to comment on the fact that they give the article a more official nature, that they give evidence that people take this issue seriously, and that they give the reader a resourse to find out more about the issue.
I also like to help but think you need to consider what the purpose of homework is. Surely it allows your child to practise what they have been learning and allow the teacher to see what they are still struggling with. Sorry if you think my comments are unhelpful.