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.
give nth decimal place of pi
Replace multiples of 5 with NaN
find radius of cone
Add two numbers
UICBioE240 problem 1.5
Determine whether the input is divisible by 3 as well as 5
Find remainder when x is divided by 3
Calculating selling price
find the mean of all elements in a matrix
Find the last digit
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