They are: 31/1, 31.0, 031 and XXXI
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There are 32C3 = 32*31*30/(3*2*1) = 4960 combinations. I do not have the inclination to list them all.
There is only one number that is equal to 15, and that is 15.
Four examples of irrational numbers are 21/2, 31/2, 51/2 & 71/3
There are no two real numbers that will add to -9 and multiply to 81. Using complex numbers, the two numbers are: (-9/2 + i9/2√3) and (-9/2 - i9/2√3)