Can you solve the below algebraic mathematical equation?

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

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

A car meter reading shows 72927 miles a palindromic number.
what is the minimum number of miles you would need to travel to see another palindromic number on the car meter reading?

A professor thinks of two consecutive numbers between 1 and 10.
'A' knows the 1st number and 'B' knows the second number

A: I do not know your number.
B: Nor do I know your number.
A: Now I know.

What are the four solutions for this?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

What is the end of everything?

What goes up but never comes down?

What does man love more than life, and hate more than death or mortal strife; that which satisfied men want; the poor have, and the rich require; the miser spends, the spendthrift saves, and all men carry to their graves?

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.