Question: What is the week with W 31-21 result?
SQL: SELECT "Week" FROM "2-18842997-2" WHERE "Result" = 'W 31-21';

Question: In week 7, what was the average attendance?
SQL: SELECT AVG("Attendance") FROM "2-18842997-2" WHERE "Week" = 7.0;

Question: Who was the opponent on September 10, 1979?
SQL: SELECT "Opponent" FROM "2-18842997-2" WHERE "Date" = 'September 10, 1979';