mary07

Quick question...

what is the difference between pronunciation of /r/ and /r~/? as in the r with the tilde on top??? i think that it is present in Puerto Rico... but I can't quite tell the difference between the two...

exxcéntrica

There is no r with a tilde on top in Spanish.

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“Aunque la conducta del marido sea censurable, aunque este se dé a otros amores, la mujer virtuosa debe reverenciarlo como a un dios. Durante la infancia, una mujer debe depender de su padre, al casarse de su marido, si este muere, de sus hijos y si no los tuviera, de su soberano. Una mujer nunca debe gobernarse a sí misma."

Leyes de Manu (Libro Sagrado de la India

maramaras

As Exxcentrica has said, there is no r with a tilde on top. But, if I am not confused, you are asking about the different pronunciation of the r in Spanish. You pronounce previo (and the r is soft) and carrera (double r much more strongly). The double r is never written at the beginning of a word, for instance, you say raro, the first r is stronger than the second one.
I hope it helps you.