No one wants to have it, but if one got it, he does not want to lose it. What is It?

What do you get if you add 2 to 100 four times?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

Can you solve the below algebraic mathematical equation?

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

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

Can you find out which options fits best with the missing column?

John speaks the truth only once a day in a week. Below are a few hints for you:

First: Days are Sunday, Monday and so on.
Second: One day he says, "I lie on Monday and Tuesday".
Third: On the next day, he says, "Today is either Thursday, Saturday or Sunday".
Fourth: On the next day, he says, "I lie on Wednesday and Friday".

Can you identify the day on which he speaks the truth?

Create a number using only the digits 4,4,3,3,2,2,1 and 1. So i can only be eight digits. You have to make sure the ones are separated by one digit, the twos are separated by two digits the threes are separated with three digits and the fours are separated by four digits