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 Sep24 awarded Autobiographer Apr21 awarded Informed Oct21 comment Is this probability question wrong to begin with? My reasoning would be along the lines that the answers given do not pertain to the question, and any mulitple choice question with 4 answers gives you a $25$% chance. So both A and D would be acceptable answers. Good question in general, though! (+1) Oct2 reviewed Reviewed Bijective conformal map example Oct2 reviewed Reviewed How can I create an expression that uses numbers 1 - 7 to equal 100? Sep27 awarded Citizen Patrol Sep27 revised Consider the function $f(x)= 0$ if $x≤0$ and $f(x)=e^{-1/x^2}$ if $x>0$. Prove that $f$ is infinitely differentiable on $\mathbb{R}$ Tag Changes Sep27 suggested approved edit on Consider the function $f(x)= 0$ if $x≤0$ and $f(x)=e^{-1/x^2}$ if $x>0$. Prove that $f$ is infinitely differentiable on $\mathbb{R}$ Sep26 comment Showing a vertical tangent exists at a given function. as a side note, if you would like to learn LaTeX, there exists a very helpful guide here on our meta site. There is also a stack.exchange site for TeX and LaTeX called tex.stackexchange if you have any questions or would like to go into specifics about it. Sep23 revised Relations between the roots of a cubic polynomial Rewrote picture in TeX and removed image. (Sorry the tags aren't square brackets!) Sep23 suggested approved edit on Relations between the roots of a cubic polynomial Sep22 comment Can I keep adding more dimensions to complex numbers? The properties of the number $i$ don't "break" the properties of the real numbers, they expand on them in a way that allows for square roots of negative numbers to be actual values. Sep21 awarded Custodian Sep18 awarded Analytical Sep18 awarded Enthusiast Sep16 comment Using the integral definition This wikipedia page might help you... Sep16 reviewed Reviewed Help Converting Octal to Decimal Sep16 reviewed Reviewed Area of twisted torus Sep11 awarded Civic Duty Sep10 awarded Critic