Replace the question mark with the correct number in the below-given picture?

When is the top of a mountain similar to a savings account?

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

Can you find the company name in the pictogram below?

What can go through glass without breaking it?

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

My location can be determined by the below rebus.
So where am i ?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

I can be cracked, made, told, and played. What am I?