Using Only Five 5's and any mathematical operator make sum as 37

You can hear me, but you can't touch or see me.

What am I?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

Outside a massage parlour, there is a board that reads
"I only massage those who do not massage themselves."

Reading the above statement, does the masseur massage himself?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

A deaf and mute man goes to the train station. Tickets for the train are 50 cents each. The man goes to the ticket booth and hands the man inside just a dollar. The man in the booth hands him two tickets.

How did the man in the booth know to give him two tickets without even looking at him?

I have branches, but no fruit, trunk or leaves. What am I?

I am an odd number. Take away a letter and I become even. What number am I?

I add 5 to 9 and get 2. The answer is correct, so what am I?

Here is what you have to do. You have to throw a ball as hard as you can but it must return back to you even if it does not bounce at anything. Also, you have nothing attached to the ball. There is no one on the other end to catch that ball and throw it back at you.

How will you do it?