By MARTIN CRUTSINGER, AP Economics Writer WASHINGTON (AP) — U.S. employers advertised slightly fewer jobs in August as hiring ticked up modestly. The number of U.S. job postings on the last business day of August dipped to 6.49 million, down from 6.7 million in July, the Labor Department said Tuesday. Those postings are off more than a half million compared with last year at this time, when