Capire gli Esponenti

Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2vP/ Traduzione in Italiano del video Understanding Exponents http://www.youtube.com/watch?feature=player_embedded&v=mJ1P4A-KA8k http://www.khanacademy.org/math/algebra/exponents-radicals/v/understanding-exponents