Change given string to number. (hint: there is already function)
Changing from ['1234'] to  is one of example
Please expand the test suite so that solutions like this do not work.
surface of a spherical planet
Back to basics 4 - Search Path
Check if number exists in vector
Find out sum of all elements of given Matrix
Replace 0 to NaN!
Solve the system of linear equations
Calculate area of sector
Make roundn function
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