This one should work for all of the test cases except that you have some numerical precision issues with the last test case. Please replace it with a numerical comparison that takes into account precision (my code is returning numbers with no decimal point but the test code returns something less pretty).
Back to basics 9 - Indexed References
peta to nano (x-ray)
Penny flipping - calculate winning probability (easy)
Try 1.5.4: Celsius to Fahrenheit
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