Yes
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15 is both rational, and an integer. is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.
No, it is not.
15000 (all integers are rational numbers).
Rational numbers are numbers that can be expressed as the quotient of two integers (3/2, 15/16). All integers, then, are rational numbers (12 = 12/1).
In rational form, 3.75 can be expressed as (\frac{15}{4}). This is because 3.75 is equivalent to 3 (\frac{3}{4}) when written as a mixed number. Converting the mixed number to an improper fraction gives (\frac{15}{4}), which is the rational form of 3.75.