What does an Island and the letter T have in common?

Find the 8 in the below-given Image.

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

What do you answer even though it never asks you questions?

Can you identify if it's a murder or a suicide ?

What's the only room from which no one can enter or leave

What does this simple rebus mean?

I inserted a coin in a bottle and closed its mouth with the help of a cork. Now, I was able to take the coin out from the bottle without taking out the cork or breaking the bottle. Can you tell me how I did it?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?