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10h
reviewed Close capillary surface problem
10h
reviewed Close Subsets of sets containing empty set
1d
reviewed Close Can every one variable equation be solved without graphing?
1d
comment Find $a$ and $b$ such that $\sqrt{9+6\sqrt{2}}=a+b$
Another solution is $a=\sqrt{3}-\sqrt{6}$ and $b=2\sqrt{6}$.
1d
reviewed No Action Needed Solve $\lim_\limits{x\to 0}\frac {e^{3x}-1}{e^{x}-1} $
Feb
2
comment Find the value of $x$ which is correct
Is this a question from an on-going contest?
Jan
31
comment Solve a system of two equations with cubic radicals
Where did the problem come from? Is it a model of some system? Please give some context.
Jan
31
comment question about number theory
What's the question?
Jan
29
comment What does $ X \sim (\mu, \Sigma)$ mean?
No need to be ashamed. :)
Jan
29
comment How $n\pi +(-1)^n \pi/6 = n\pi + \pi/6$ and $n\pi - (-1)^n \pi/6 = n\pi - \pi/6$?
See my edit, please.
Jan
29
revised How $n\pi +(-1)^n \pi/6 = n\pi + \pi/6$ and $n\pi - (-1)^n \pi/6 = n\pi - \pi/6$?
added 97 characters in body
Jan
29
comment What does $ X \sim (\mu, \Sigma)$ mean?
I'm not being sarcastic. The text reads "We write for a random vector ..." I interpret this to mean "We use the following notation for a random vector ..."
Jan
29
answered What does $ X \sim (\mu, \Sigma)$ mean?
Jan
29
answered How $n\pi +(-1)^n \pi/6 = n\pi + \pi/6$ and $n\pi - (-1)^n \pi/6 = n\pi - \pi/6$?
Jan
29
comment Height as a function of time word problem
Identify the relevant variables, assign symbols to them. Then write down all the formulas you know involving them that might be relevant. Edit your question to include your efforts.
Jan
29
comment What is Ratio of winnings?
You have to be at least 13 years old to use Stack Exchange. (See the second paragraph of section 1 here.)
Jan
28
reviewed Reject Can a group of order $385$ be non abelian?
Jan
28
comment Combination - Distribution of gifts
And if you have an infinite number of gifts to give, then you would have an infinite number of combinations, right?
Jan
28
comment Combination - Distribution of gifts
Then you should edit your question to start "Seven types of gifts" ...
Jan
28
comment Combination - Distribution of gifts
How can you have infinitely many gifts to give when you only have seven at the start?