If my over-use of str2num has in any way caused offense, I hereby beg leave to apologize.
My hat's off to you for such a solution. I'm baffled as to how to decode it (pun intended). I know that there has been a lot of furor over the use of regexp and other string-based functions, conversions, etc. to lower solution sizes for problems in general, but this problem is string-based, so I see no problem in solving it via arcane string methods.
Calculate the area of a triangle between three points
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Determine if input is a Narcissistic number
Min of a Matrix
Divisible by 14
Rule of mixtures (composites) - upper bound
Consecutive Equation Times (of the day)
Evened up (or not)
Divisible by 5
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