73 is a whole number (an integer).
As all integers are rational, 73 is rational.
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The first number is 0, the additive identity for the set of numbers. The second, 73 is a positive integer or counting number and the third, 38.5 is a decimal representation of a rational number.
73 is an integer and not a fraction. However, it can be expressed in rational form as 73/1 which cannot be simplified.
As much as, in these days of uncertainty, anything can be anything. As long as the constraints of a rational number are kept to, a rational number will always remain a rational number.
Yes.
Yes, but only if the rational number is 0.