Can you solve the below algebraic mathematical equation?

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

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

A boy was driving a car, a girl took a lift from her. She asked his name. The boy said - my name is hidden in my car’s number, find it if you can. After this, she got down Car number was [ WV733N ] Can you guess the name now?

Replace the (?) with the correct mathematical signs to make the expression equal to 59.

18 ? 12 ? 4 ? 5 = 59

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

What makes this number unique: 8,549,176,320?