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.
Back to basics 9 - Indexed References
Angle between Two Vectors
Calculate distance travelled when given radius and rotations
Fibonacci-Sum of Squares
Flip the vector from right to left
Musical Note Interval 1 - Diatonic Scale
Divisible by n, Truncated-number Divisors
Scrabble Scores - 7
Approximation of Pi
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