Given the vector A, return B in which all numbers in A are doubling. So for:
A = [ 1 5 8 ]
B = [ 1 1 5 5 8 8 ]
Remove all the words that end with "ain"
Flip the main diagonal of a matrix
Replace Vector Elements
Simple equation: Annual salary
Flip the vector from right to left
Divisors of an integer
Solving a quadratic equation
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