Can you decipher the below rebus?

PBLUESAISNUERSES

These types of puzzles are known as charades. What you have to do is to find two words that are referred to in the first stanza and the second stanza and put them together to form the third word in the third stanza.

Just for example, if my first refers to 'off' and my second refers to 'ice', then my whole will be the 'office'.

My first is present - future's past -
A time in which your lot is cast.

My second is my first of space
Defining people's present place.

My whole describes a lack of site -
A place without length, breadth, or height.

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Which number should replace the question mark?

If two's company, and three's a crowd, then whats four and five ?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

A man is found dead in his bathroom naked with blood scattered all around him. The bathroom was locked from the inside and there is no trace of any struggle. There is nothing in the bathroom except his pant with the belt still around and his shirt. Also, the medic team can't find any incision in his body that may have been the reason behind so much blood loss.

The Police department is clueless regarding this murder mystery.
Can you?

What is at the end of a rainbow?