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

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

Count the Triangle in the figure given below:

Can you count the number of lines in the below picture?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

French Police inspects a room where there are no windows, no doors, no tables and is almost empty expect there is just a puddle of water. They found a dead man who obviously hung herself from the ceiling, but they are not able to figure out how this had happened.

John and Jacob entered the crime scene and easily able to solve the case.

How did the man die?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

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?

Can you find the hidden animal in the picture below?