Not really my solution... just a slightly cheating version of @bmtran's.
Energy of a photon
Scoring for oriented dominoes
Whether the input is vector?
Convert from Base 10 to base 5
Is the input divisible by 3?
Back to basics 17 - white space
Back to basics 22 - Rotate a matrix
Back to basics 15 - classes
Back to basics 21 - Matrix replicating
Back to basics 13 - Input variables
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