Write a function that calculates the ratio between the sum of the prime numbers lower or equal than x, and the sum of the non-prime numbers lower than x.
test case #2 is not correct.
Maximum value in a matrix
Find out magnitude of vector
Calculate the number of elements in a matrix.
Speed of car travelling x meters in y seconds
Approximate the inverse tangent by power series
Double the next!
Say type of roots in quadratic equation
Check if is a square
Get the value 100
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