Answer:
They're playing together while we're eating soup.
Please give more context in order for me to answer this question.
Because she had been invited to a fancy party at the minister of Education palace
The sentence is not subjunctive because it actually happened if the person wished or desired that thing to happen then it will be subjunctive.
Hope this helps :)
Both would be fine, I prefer to the one that takes most energy first.
if you were writing the essay, I would start with the essay because it uses a lot of energy from your hand.
If you were typing it, I'd start with math because it uses your brain a bit more.
Honestly, I don't really get what you mean by using energy but that was my best.