find the first elements of a column matrix
This would be better as "find the nth element of an array." Also, a column matrix doesn't exist. Perhaps you meant column vector, though the variables in your test cases are row vectors.
First non-zero element in each column
Is the Point in a Circle?
Is it an Armstrong number?
Convert yards to feet
Rotate matrix by -90 degrees
multiply an array by its position number
modulus of a number
Calculating selling price
find the mean of all elements in a matrix
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