How can you make number one disappear by adding something to it?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

Something Extraordinary happened on May 6th 19778 at 12:34am what was that?

A large water tank has two inlet pipes (a large one and a small one) and one outlet pipe. It takes 3 hours to fill the tank with the large inlet pipe. On the other hand, it takes 6 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 9 hours.

What fraction of the tank (initially empty) will be filled in 0.64 hours if all three pipes are in operation? Give your answer to two decimal places (e.g., 0.25, 0.5, or 0.75).

Count the number of lines in the image below ?

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

In the image below, can you find the value of an angle(y)

I am quite hot but become too cold if you remove the first two letters. What am I?

Can you decipher the two rows to find the hidden word?

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