Write a function that combines two lists by alternating the elements, e.g. ['a','b','c'], ['1','2','3'] → 'a1b2c3'.
Times 2 - START HERE
give nth decimal place of pi
Return the first and last character of a string
Determine the square root
Check that number is whole number
Double the next!
Approximate the inverse tangent by power series
Get the value 100
Check if is a square
Say type of roots in quadratic equation
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