The title and description of this problem have been cleaned up. Also, its test suite has been expanded and improved.
Sum the Digits of a Number
Simple equation: Annual salary
Compute LOG(1+X) in natural log
Summation of array
Determine the mean of matrix
Calculate the values of a polynomial.
Sum positive elements of matrix.
Select primes from the matrix.
Calculate roots of polynomial given as vector array.
Multiply two polynomials p and q given in in vector representation.
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