CREATE TABLE "schedule" (
  "week" real,
  "date" text,
  "opponent" text,
  "result" text,
  "venue" text,
  "attendance" real
);

Question: Attendance of 48,510 had what highest week?
SQL: SELECT MAX("week") FROM "schedule" WHERE "attendance"='48,510';

Question: Opponent of at san francisco 49ers had what lowest week?
SQL: SELECT MIN("week") FROM "schedule" WHERE "opponent"='at san francisco 49ers';