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May
20
comment Identification of a quadrilateral as a trapezoid, rectangle, or square
@daniel, that question is speculative at best! If the teacher didn't create the problem, then my immediate concern is still with the teacher (and not the creator). That they would insist on a wrong answer is the point of this post.
May
19
awarded  Nice Question
May
19
revised Identification of a quadrilateral as a trapezoid, rectangle, or square
added 1 character in body
May
19
comment Identification of a quadrilateral as a trapezoid, rectangle, or square
Right, and I showed this to my student yesterday. I'm wondering if the class is just at that place where, if you draw [what kids call a square], then it's a square.
May
19
asked Identification of a quadrilateral as a trapezoid, rectangle, or square
Apr
14
comment Possible solutions of a diophantine equation: $p^2+pq+275p+10q=2008$
Ah yes. It's been a while since I've had to make use of a/the trick =)
Apr
13
comment Possible solutions of a diophantine equation: $p^2+pq+275p+10q=2008$
$(7,2)$? $$$$$$$$
Mar
27
comment Can $y=\frac{e^\frac{t^4}{12}}{e^{\frac{t^3}{3}}}$ be simplified?
What a roller-coaster! And @CSil, there's nothing wrong with this answer. You are still left to calculate the difference in the exponent, but now you know the property at work.
Mar
11
comment Throwing coin 6 times, probability to get H is 1/3. what is the probability to get H in 2 first throws?
en.wikipedia.org/wiki/Conditional_probability
Mar
6
awarded  Yearling
Mar
2
awarded  Popular Question
Jan
29
comment Find the derivative of the question mentioned
I got the same result, modulo the order of terms in the numerator/denominator
Jan
24
comment Can we find the inverse for a vector
If you are looking for a multiplicative inverse, you should start thinking about vector multiplication and what the multiplicative identity is (or would be).
Jan
22
comment Expected value of prime lottery ticket
Your expected loss is $8.06
Jan
22
answered How to go about solving this inequality question?
Jan
22
comment How to apply the Chain rule when using standard integrals/differentials?
When integrating, it's call u-substitution.
Jan
22
comment Why is $\frac{\sqrt{x+1}-1}{x}$ equal to $\frac{1}{\sqrt{x+1}+1}$?
I'd check the domain restrictions, @servabat. Also, note that the second equality follows from the difference of two squares.
Jan
22
comment How they deduce that $\det A=1$ just from the first coefficient and minor
This appears to be a special case that relies on some sort of symmetry in the cofactor expansions along the top ow or left column. But I'm not sure how to explain it concretely.
Jan
22
revised Is there a rule of integration that corresponds to the quotient rule?
rolled back to a previous revision
Jan
22
comment factor the following expression $25x^2 +5xy -6y^2$
Imagine that - someone who actually knows how to teach!