This user (ALBERT ALEXANDER STONIER) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
Replace NaNs with the number that appears to its left in the row.
Sum the elements in either diagonal of a square matrix
Are you in XY plane?
Lunar Arithmetic (Addition)
Modular multiplicative inverse
Go back n times
Net Present Value of a Stream of Cash Flows
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