CREATE TABLE table_43154 ("Week" FLOAT, "Date" TEXT, "Time  (  PT  ) " TEXT, "Opponent" TEXT, "Result" TEXT, "Record" TEXT, "Game site" TEXT)

What opponent has a week less than 16, with September 7, 2008 as the date?
SELECT "Opponent" FROM table_43154 WHERE "Week" < '16' AND "Date" = 'september 7, 2008'
SELECT "Opponent" FROM "table_43154" WHERE "Date" = 'september 7, 2008' AND "Week" < '16'