Can you solve the below algebraic mathematical equation?

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

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

what's the probability of getting a king or a queen from a pack of 52 cards?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

You walk into an old horror house. It has no power or plumbing. Once inside, you see three doors. Each door has a number on it. Behind each door is a way for you to die. Behind door number one, you die by getting eaten by a lion. Behind door number two, you die by getting murdered. Behind door number three, you die by an electric chair. You can’t turn back, so you have to go through a door. Which door do you go through?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

Different lights make me strange by changing me into different sizes. What am I?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

What is always in front of you but can’t be seen?