Can you replace the question mark with the correct number in the below table sequence?

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

Why is a river so rich ?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

Which flower has two lips?

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?

Which is the smallest number that you can write using all the vowels exactly once?