Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

In a chess board, the queen piece can move horizontally, vertically and diagonally freely. The picture represents the same.Can you place 8 queens on the board in a manner that none of the queens can attack each other?

What kind of band never plays music?

How far can you walk into the woods?

How many triangles are there in the picture below?

What does this simple rebus mean?

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

Can you find the key in the picture below?

What does does this rebus picture means ?

Can you count the number of triangles in the given picture?