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A rational number can be expressed as a fraction whereas an irrational number can't.
The additive identity for rational numbers is 0. It is the only rational number such that, for any rational number x, x + 0 = 0 + x = x
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A rational number is any number that does not have an infinite number of digits. So, as you wrote it, 2.8333333 is a rational number. However, if you meant the 3s to go on forever (as in the number 2.8 + 1/30), that would be an irrational number.
I cannot see any numbers. If I were to guess what numbers were meant to be in the question then I may as well make up my own questions and answer them!