Because they are terminating decimals
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Any number that can be expressed as a fraction is a rational number otherwise it is an irrational number.
The number 3.863401035 is a rational number because it can be written as a fraction. It can be expressed as 3863401035/1000000000 or simplified further.
It is a rational number because it can be expressed as a fraction in the form of 1581/50 simplified
The number 5 is indeed a rational number. A rational number is one that is able to be written down as a simplified fraction. The number 5 would be written as 5/1.
It is already a decimal and a rational number because it can be expressed as fraction in the form of 48/5 simplified