HELP! HELP! CALLING ALL WITH HELP! HELP ME!?

It's 4.

In base three, 11. In base 4, 10.

It's the square root of 16, the cube root of 64, and the square of 2.

It's 2*2 and also 2^2, as well as ((2*2-2)^2*(2/2)-(2/2)*2)*(2^2-(2^2)/2).

It's the number of wizards in the Triwizard Tournament, in the fourth book of Harry Potter, which is the fourth book no matter from which end of the series you count. It's the number of valence electrons in a carbon atom and the number of protons in a beryllium atom. It's the number of legs on the average cat and the number of arrow keys on a keyboard and the number of vowels that can be drawn using only straight lines (A, E, I, and Y). It's the only number with the same number of letters in its name as the actual number it describes. It's the number you get when you "put two and two together," as the saying goes, which brings us back full circle to your question. Hope that helped!

2+2= 4

Question: how old are you?