tables, chairs and the table covers?

No, you can never assume. Always ask.

No. It is not automatically assumed. This is something you should ask about before you book a venue. And you should make sure the specifics are written out in your contract with the venue.

Absolutely not assumed, but many do! Otherwise the rental services wouldn't be in business.

When it comes to weddings NEVER assume anything. Doing so will only cause unexpected surprises on the wedding day. This applies not only to your wedding venue but to everything else florist, DJ, cake, church, etc.