The letters are reversed. Thus, DUST becomes STUD.

The letters are reversed. RAT becomes TAR.

Each letter is shifted back by 1. B -> A, O -> N, O -> N, K -> L.

90 degrees from north is east.

If today is Friday, then tomorrow is Saturday.

Facing north, turning right to east, then left 180 degrees leads to south.

The pattern skips one letter each time: A (B) C (D) E (F) G (H) I.

All numbers except 30 are perfect squares.

A hand is part of an arm, just as a foot is part of a leg.