Square a number
I would recommend more test cases, including some of matrices.
This user (ALBERT ALEXANDER STONIER) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
The Goldbach Conjecture, Part 2
Determine Whether an array is empty
Matlab Basics II - Velocity of a particle
Find the area of a triangle
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