15 + 0.07 is rational.
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Any integer, whether positive or negative, is a rational number. It can be expressed as a fraction with a negative numerator and a denominator of 1.
Well, isn't that a happy little question! No, 2 over 15 is not irrational. In fact, it is a rational number because it can be expressed as a simple fraction. Just like painting a beautiful landscape, math can be quite lovely once you understand its different forms.
7.5
Any rational number does.
1.5 is a rational number. It can also be written as 15/10