Jay earns $8 an hour when he works at his uncle's store. He earns $9 an hour when he does yard work for his neighbor. Which expression represents the total amount he will earn in a week when he works u hours at his uncle's store and v hours doing yard work for his neighbor? 8 u + 9 v 8 (u minus v) + 9 (v minus u) 17 u v 17 (u + v)