#24 is False - we don't reference the endline when we are judging overlapping, only the sidelines and centerline.
#34 is True - you fell into the trap that NFHS set this year in the Preseason Guide and the PowerPoint slide. The libero can finger set a ball from anywhere on the court, however, to be legal, the next contact must be from below the top of the net. In the scenario, the libero in the front zone, set the ball while it was below the height of the net and it crossed the net. Result - no foul, legal play.
#42 is False - since no contact was made, there was no back-row block.
Not my interpretations, but those of NFHS.