Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2wn/ Esercizi: http://www.khanacademy.org/exercises?exid=functions_3 Traduzione in Italiano del video Functions (Part III) http://www.youtube.com/watch?v=5fcRSie63Hs http://www.khanacademy.org/video/functions--part-iii?playlist=Algebra