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4h
comment Solve a system of three equations
Still working at it?
4h
comment solve another system of three equations
So, how is the rearrangement process going?
4h
comment Algebra with two variables
Good. I'll vote to reopen the question. If it gets reopened, you can post this answer --- it seems better to me than using a lot of algebra.
4h
comment divisibility gcd
That's a bit more than "a push in the right direction".
18h
awarded  Nice Answer
21h
comment volume of the pyramid stub in points.
This is not a place to dump undigested, unsourced, unmotivated problems with no sign of any effort beyond copy-paste. This kind of post is often closed, very quickly. Rather state what you know about the problem.
21h
comment divisibility gcd
$c\mid a$ implies there exists $d$ such that $a=cd$. There's your push.
21h
revised simplifying complex fractions
edited tags
21h
comment How to use first derivative of a square root to find $x$
No, Nikita is suggesting that you could minimize $C^2$ instead of minimizing $C$ --- the same $x$ does both jobs.
1d
revised Find the number $n^{2}$ from the number $n^{n^{n^{2}}}$
formatting
1d
comment Find the number $n^{2}$ from the number $n^{n^{n^{2}}}$
You don't know where you saw the problem?
1d
comment Algebra with two variables
Any thoughts about my comment, Old?
1d
comment Find the number $n^{2}$ from the number $n^{n^{n^{2}}}$
I say, PLEASE, WHAT IS THE SOURCE OF THIS PROBLEM?
1d
comment solve another system of three equations
I'm sorry that you feel insulted. I was trying to point out that there was no need of matrices to solve this problem, that it could be solved using high school algebra. A surprising number of hard problems can be solved using high school algebra --- high school algebra is a very powerful tool!
1d
comment The relationship between subfields and subgroups of a finite field.
Have you tried working through any examples with small values of $m,n,k$?
1d
comment Quadratic forms and midpoints
@Yves, isn't "homogeneous" part of the definition of "form"?
1d
comment Solve a system of three equations
OK. Let me know when you have the equations rearranged. By the way, if you want to be certain that I see a comment, you should put @Gerry into it.
2d
comment solve another system of three equations
It can be solved using high school algebra, with no matrices. Maybe if you were to show what you did to get the wrong answer, someone could point out where you went wrong, and then you'd be able to do future problems correctly.
2d
revised Solve a system of three equations
formatting, retag
2d
comment Solve a system of three equations
The first equation is $4x(a+c+d)=4a-2c+d$, which is $(4x-4)a+(4x+2)c+(4x-1)d=0$. Similarly the other two equations can be rewritten in the form $Pa+Qc+Rd=S$ for some coefficients $P,Q,R,S$ not involving $a,c,d$. So you get three linear equations in the three unknowns, $a,c,d$. Do you know how to solve such a system?