Solve given expression.
Note that this problem uses the word solve when it needs to say EVALUATE.
Also the required code to pass the tests shouldn't be available by COPY-AND-PASTE from Test Suite!
Flip the main diagonal of a matrix
Matlab Basics II - Log and natural log
Skip by a multiple
Multiply by 3
Calculate the values of a polynomial.
Find hen's weight.
Select primes from the matrix.
Form a square matrix from four square sub-matrices
Convert array of decimal numbers into hexadecimal numbers array.
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