This question is from my friend. he think that there is trigonometry involved to this equation. $\sqrt{7+2\sqrt{7-2\sqrt{7-2x} } } =x$ that is from $\ \ \...

Sorry to sound incredibly ignorant, but I am...at least in math anyway. What does this symbol: $\int$ mean?

So we define a sequence as a sequence ${a_n}$ is said to converge to a number $\alpha$ provided that for every positive number $\epsilon$ there is a natur...

I need to crack a stream cipher with a repeating key. The length of the key is definitely 16. Each key can be any of the characters numbered 32-126 in ASC...

How many $11$-digit numbers are there which contain all of the digits $0$-$9$ at least once? Note that in this question a number cannot begin with a digit...

This is another grade school problem that's giving me trouble (posting on someone else's behalf). I can see that a 36 inch semi-circumference yi...

Given $$x^2=100$$ $$x=\pm 10$$ This is acquired by taking the square root of both sides. So given: $$x^4=10,000$$ $$x=\pm 10$$ This is done by taking the ...

When I look this up I get an unambiguous definition that $f(x) $ decays exponentially if it is a function of the form $f(x) = Ae^{-\lambda x}$ for some re...

I got stuck to find a fair formula to calculate the average ranking of the items that I found after consecutive searches, look: If I calculate the simple ...

I can't find too much about this by myself when googling and I am confused overall. So I decided to ask here. So I'm trying to convert a Signed ...