What does this mathematical rebus means ?

What goes up but never comes down?

what does the below rebus means?

Using mathematical symbols like +, -, and x in order to make the equations correct. Replace # with the above-given symbols.

9 # 8 # 7 # 6 # 5 # 4 = 91

I have Rs.50 and I spend it in the way as below.

If all the below statements are true

1. Gianni was either in Italy or France in 1997.
2. If Gianni did not kill Versace, Hilton must have killed him.
3. If Versace died of suffocation, then either Gianni killed him or Versace committed suicide.
4. If Gianni was in Italy in 1997, then Gianni did not kill Versace.
5. Versace died of suffocation, but he did not kill himself.

Who killed Versace and where was Gianni in 1997?

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

How can you make number one disappear by adding something to it?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

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