There are infinitely many rational numbers between any two rational rational numbers (no matter how close).
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It is a rational number.
define or describe each set of real numbers?
Oh, dude, seven belongs to the set of natural numbers, whole numbers, integers, rational numbers, real numbers, and even complex numbers if it's feeling extra fancy. Like, seven gets around, you know? It's like the popular kid at the number party.
It is rational. An irrational number is a number that you cannot define by a fraction or a decimal. Since you wrote it as a decimal, it is rational. The fact that it is negative does not matter.