Same issue here as in your third problem. Please check the absolute value of the differences of the computed values with the correct ones. Otherwise, more silly answers (again, like this one :-) will slip through!
Thanks for the catch. I've updated the test suite to check against upper and lower bounds of each answer.
Is the Point in a Triangle?
Calculate the area of a triangle between three points
Sophie Germain prime
Divisible by 15
Cycling — Normalized Power
Rumis Scorer 1
Temperature Conversion Utility (Strings)
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