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.
Swap the input arguments
How to subtract?
Add two numbers
Make a 1 hot vector
frame of the matrix
Rule of mixtures (composites) - upper bound
Cycling — Critical Power
Stress-Strain Properties - 5
Calculator spelling - Numbers to Letters
Lights Out 7 - 5x5, x moves
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