Translation:One can cook with various powders.
Please answer this question: Man means you but in a general sense as in not specificaly the person you're talking to, and du/ deg means you specifically ?
Yes. You can also use one (One can also use one) instead of you. I often use one just to remind myself that Norwegian doesn't use du the same way we do in English.
It's accepted on our end. It's always a good idea to quote your entire and exact translation if you want help with figuring out why it wasn't accepted. :)