solutions are rounded in a somewhat arbitrary fashion...
Your value of pi is wrong.
The problem should specify that the used value for pi is 3.1416 (since this is not its true value), and that we need to use floor with precision of 4 decimal places.
Specific Element Count
Doubling elements in a vector
Area of a circle
Find Month & day for given day number of a year
Moore-Penrose pseudoinverse of matrix
Rank of matrix
Change number representation to HEX
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