Knowing that 123-45-67+89=100, write a function that gives this result for any order of the digits in the input. Otherwise, the function should give 'NaN'.
Make a Palindrome Number
Implement a ROT13 cipher
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
Side of an equilateral triangle
Skip by a multiple
Approximate the inverse tangent by power series
Check if is a square
Say type of roots in quadratic equation
Alternating 1´s and 0´s in a matrix
Ratio between sum of primes and sum of factors
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