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.
Multiply a column by a row
Switch matrix to a column vector
Calculate the Number of Sign Changes in a Row Vector (No Element Is Zero)
Find the hypotenuse
Find the index of the largest value in any vector X=[4,3,4,5,9,12,0,4.....5]
Dice roll - opposite faces
Rule of mixtures (composites) - upper bound
Divisible by 12
Scrabble Scores - 6
Rule of mixtures (composites) - lower and upper bounds (volumes)
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