CREATE TABLE table_69434 ("School" TEXT, "Location" TEXT, "Mascot" TEXT, "# / County" TEXT, "IHSAA Class" TEXT, "Year Joined" FLOAT, "Previous Conference" TEXT)

what is the correct year for # / county of 09 cass?
SELECT "Year Joined" FROM table_69434 WHERE "# / County" = '09 cass'
SELECT "Year Joined" FROM "table_69434" WHERE "# / County" = '09 cass'