Can you find out which number multiplied by itself will give the output as 12345678987654321?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

I look at you, you look at me I raise my right, you raise your left. What am I?

I have teeth but i don't bite. Who Am I ?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

Nodes are shown below and you need to connect them based on the following rule: Every node can be connected to the number of nodes inside them, i.e. the first node there is a value of 1 which indicates that the first node can connect to exactly one node only.Can you do it?

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

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

There is a place where if I stand up straight, I will still be considered sideways.