How many slots of RAM does this laptop have?
http://www.bestbuy.com/site/hp-pavilion-17-3-laptop-4gb-memory-750gb-hard-drive-anodized-silver/3215015.p?id=1219089114771&skuId=3215015
http://www.bestbuy.com/site/hp-pavilion-17-3-laptop-4gb-memory-750gb-hard-drive-anodized-silver/3215015.p?id=1219089114771&skuId=3215015