"contestar" is a transitive verb
"contestar" is a transitive verb, which means it can take a direct object. (no preposition ). But, in " contestar a las preguntas" , I wonder why there is a preposition "a" before the object "las preguntas"?

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Well, both forms are correct. "Contestar a las preguntas/contestar las preguntas" (reply to questions/reply questions). First case is just a compound form. Language is not mathematics :-)

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I think that "contestar las preguntas" is more correct than "contestar a las preguntas", but the second sentence is said in Spain nowadays. 

"Yo contesto a los periodistas" is correct, but "yo contesto los periodistas" is a mistake.

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