Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

In Greek mythology, the Sphinx sat outside of Thebes and asked this riddle of all travellers who passed by. If the traveller failed to solve the riddle, then the Sphinx killed him/her. And if the traveller answered the riddle correctly, then the Sphinx would destroy herself. The riddle:

What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Oedipus solved the riddle, and the Sphinx destroyed herself.

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

A man was just doing his job when his suit was torn. Why did he die three minutes later?

What is black when you buy it, red when you use it, and gray when you throw it away?

I have an eye but still cannot see.

Who am I?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

Look at the picture and find out which square is not linked with any of the other squares.