What does below rebus means ?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

Wednesday, Steve and Pam go to a restaurant to eat lunch. After eating lunch, they pay the bill. But Steve and Pam do not pay the bill. So…who does?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

I can write cow in 13 letters.

Can You?

John and Jenni are a married couple. They have two kids, one of them is a girl. Assume safely that the probability of each gender is 1/2.
What is the probability that the other kid is also a girl?

Hint: It is not 1/2 as you would first think.

Can you find out the number that should replace the question mark with a valid reason?

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

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?