Okay, I'm not sure which one you're talking about but one of them is a rule in algebra
You have to replace the COD with a pronom personnel COD (me, te, le/la/l’, nous, vous, les) en the COI with a pronom personnel COI (me, te, lui, nous, vous, leur)
So the first one will be: Vous les leur rendez. Because vos devoirs is the COD and will become les and à vos professeurs is the COI and will become leur.
I hope you understand this and you’ll manage to solve the rest by yourself. If needed I can solve the other questions for you too.
Answer:
I'd like to, but we're missing some info here. I need David's time schedule to be able to answer this.
Answer:
It means "A typical young Frenchman spending an hour a week playing sports"
Explanation:
Hope it helps :)