CREATE TABLE table_21915 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Game site" TEXT, "Record" TEXT, "Attendance" FLOAT)

How many people attended the Week 8 game when Denver played Buffalo?
SELECT "Attendance" FROM table_21915 WHERE "Week" = '8'
SELECT "Attendance" FROM "table_21915" WHERE "Week" = '8'