what does the below math rebus puzzle mean?

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

I am a word that begins with the letter “i.” If you add the letter “a” to me, I become a new word with a different meaning, but that sounds exactly the same. What word am I?

Decode this picture on T-Shirt and tell what it says ?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different.

How do you measure 45 minutes?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.