Oh, dude, like, totally. A rational number is any number that can be expressed as a fraction, and 1.85 can be written as 185/100, which is totally a fraction. So, yeah, 1.85 is indeed a rational number. Cool, right?
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Yes because it can be expressed as a fraction in the form of 37/20 in its lowest terms
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Yes.
It must be a generalised rational number. Otherwise, if you select a rational number to multiply, then you will only prove it for that number.
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Yes. Any rational number divided by another rational number is also rational.