What does this rebus puzzle means ?

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

A man wants to cross the pit of fire which is 25 feet in length and he has 2 planks(fire resistant) 19 feet in length. How can he cross the pit of fire alive?

How many times can you subtract the number two from the number fifty?

Count the number of lines in the image below ?

In my garden, I have many trees but only one of them is the mango tree. In these mango trees, there are some mangoes(as expected).

But after a strong wind, there are neither mangoes on the tree nor on the ground. Explain?

What number divided by 4 is the same as that number minus 4?

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

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

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