CREATE TABLE table_name_29 (attendance VARCHAR, game_site VARCHAR, result VARCHAR)

Game Site of hoosier dome, and a Result of l 7 31 involved what attendance?
SELECT attendance FROM table_name_29 WHERE game_site = "hoosier dome" AND result = "l 7–31"
SELECT "attendance" FROM "table_name_29" WHERE "game_site" = "hoosier dome" AND "l 7–31" = "result"