Yes - the proper fraction 7/19 is a rational number.
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7/19 itself is a fraction - though its decimal equivalent, equal to 0.368421052631578947 recurring (that is, 0.368421052631578947368421052631578947...) is a rational number.
is 5 over 7 a rational number
Yes 13/19 is rational because any number that can be expressed as a fraction is a rational number
Yes.
Yes.