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.
Energy of a photon
Multiply 2 numbers
Deleting an element in a matrix
Divide by 4
Delete blanks at the end of string
Find minimum and maximum elements of an array
Output a vector which is table of 9
Change number representation to HEX
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