Sub situations

[wisref2]

Please include rule or casebook references:

1 - A1 is fouled and A is in the bonus. Before the first free throw, A calls a timeout. After the warning horn, A6 checks in as a sub. The officials deny entry. After the first free throw, the horn sounds again. What do you do with A6?

2 - A1 is fouled and A is in the bonus. Before the first free throw, A calls a timeout. During the timout, A6 replaces A2. After the first free throw, A2 reports as a sub and the horn blows. What do you do with A2?

3 - A is called for a violation. Substitute B6 is beckoned on the court and replaces B1. During the deadball period, the coach of A has been irate about the call. After the substitution is completed, the A coach receives a technical foul. B1 reports to the scorer's table wanting to check into the game to shoot the free throws for the T.