Can you solve the below tricky visual equation?

What is the below Rebus indicate?

With the help clues provided in the image, can you find the 5 digit key?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Why do you find that most of the buildings are deprived of the 13th floor?

I have a mouth but I don't eat.
I have a bank but have no money.
I have a bed but i dont sleep.
I wave but have no hands.

Who Am I ?

There's a day, that comes around once a year.
To celebrate the man, you hold dear.
He gave you life, love and will pick you up if you fall.
When it comes to guys like him, He's the best of all.
Who is he?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation. Conditions: Each must be used exactly once and no other numbers or symbols can be used.

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?