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.
Number of 1s in the Binary Representation of a Number
Replace May with April
Find out magnitude of vector
Finding perimeter of a rectangle
Find minimum and maximum elements of an array
Change number representation to HEX
Delete blanks at the end of string
Find Month & day for given day number of a year
Moore-Penrose pseudoinverse of matrix
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