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

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

Solve the following series:
AZ, GT, MN, __, YB

If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?

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

What English word has three consecutive double letters?

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

There was a minor accident with a doctor's son but the doctor noticed no major injury. After the treatment, the father of that doctors son is sitting with the son of the doctor without the doctor being in the room.

How can this be possible?

What can you hold in your right hand, but never in your left hand?

How can you take 2 from 5 and leave 4?