Four questions

[sj]

Some things creating some arguments.

1) A1 jumps to attempt a three-point shot but the ball immediately slips out of his hands and goes backwards and away from the basket. He returns to the floor and takes 2-3 steps to get to the ball where he taps the ball to a teammate. Ruling?

2) A1 jumps to attempt a three-point shot but the ball immediately slips out of his hands and goes backwards and away from the basket. He returns to the floor and takes 2-3 steps to get to the ball where he grabs the ball regaining control. Ruling?

3) A1 jumps and releases the ball on a try. The ball is in the air when A2 shoves B1 and the official blows the whistle. After the whistle is blown the ball goes through the basket. Does the basket count?

4) A1 attempts a try near the basket. In a legitimate attempt to block the shot defender B1 misses the ball and slaps the backboard. As a result of the slap the backboard is moving. The ball goes off the glass, hits the moving rim, and bounces out. Ruling?