Yes 13/19 is rational because any number that can be expressed as a fraction is a rational number
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Yes - the proper fraction 7/19 is a rational number.
7/19 itself is a fraction - though its decimal equivalent, equal to 0.368421052631578947 recurring (that is, 0.368421052631578947368421052631578947...) is a rational number.
0.019 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its equivalent, in rational form, is 19/1000.
0.19 is, itself, a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its equivalent, in rational form, is 19/100.
It is a rational number because it can be expressed as a fraction in the form of 19/33 = 0.'57' repeating '57'