Yes any number that can be expressed as a fraction is a rational number
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Negative 16 over 5 in a mixed number = -31/5
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16/9 is a rational number.And if it were not, there would be no way to write it that could make it one.1.777777777777778
The negative square root of 16 is -4. It can be written as the ratio of 792 to -198, so it's rational.
4 rational because 4 times 4 is 16 and there is nothing to start a pattern, its a plain number so its rational, irrational would be a number with no pattern like 18.86743038434953949345..., another rational is like 18.3333333... or 18.123123123123123123123123123..., or 95.8989898989898989..., because they have patterns.