What famous saying does this rebus mean?

COME SERVED <---
COME SERVED
COME SERVED
COME SERVED
COME SERVED

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?

What does the below mathematical rebus mean?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

What number do you get when you multiply all of the numbers on a telephone's number pad?

How many triangles are there on the puzzle below?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

Where do you go to learn how to make ice cream?

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

Name the three-letter word that can complete the below words?

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E