If 21x = 79x, what is the value of x?

Can you solve below mathematical equation?

2^1234 - 2^1233

Replace the question mark with the correct number.

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

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

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

What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

Can you replace the question mark with the correct number?

I am a mother. However, I never give birth.

I am a father. However, I never nurse my children.

Wandering is not possible for me, but standing still happens occurs rarely.

Who am I?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

A woman lives in a skyscraper thirty-six floors high and is served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?