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.
Increment a number, given its digits
Back to basics 26 - Keywords
Compute a dot product of two vectors x and y
Add a row of zeros on top of a matrix
Find remainder when x is divided by 3
Determine whether the input is divisible by 3 as well as 5
modulus of a number
find a specific element from an matrix
Find the last digit
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