What does this below rebus puzzle mean?

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

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

You have a basket containing ten apples. You have ten friends, who each desire an apple. You give each of your friends one apple.
Now all your friends have one apple each, yet there is an apple remaining in the basket.
How?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Detective Rockford was jogging near the beach at 4:30 am.
He hears a sound near the shack "No Michael, Please Do not shoot me".
Next instance he heard the sound of gunfire. Rockford rushes to the shack where he finds women lying dead and a gun in close proximity of three "Doctore Lawyer and a Teacher".

Rockford immediately knew that the Lawyer has committed the crime. How?

Replace the question mark with the number below given a simple math problem.

what does the below rebus mean?

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

What goes up but never comes down?