Can you solve the maths in the below-given picture equation?

Outside a tattoo artist's shop, there was a signboard which read 'I make tattoos on only them who do not tattoo themselves'.

Reading it what do you think, does the tattoo artist tattoo himself?

what does this picture(rebus) riddle means ?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

What is the riddle which can be asked all day with a different correct answer each time.

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)

Christina makes tasty toast in a small pan. After toasting one side of a slice, she turns it over. Each side takes 30 seconds. The pan can only hold two slices.
How can she toast both sides of three slices in 1 & 1/2 instead of 2 minutes?

It is always ahead of me yet I can never see it. What is it?