CREATE TABLE table_27529608_21 (qtr_final__week_ INT, name_name_of_act VARCHAR)

What is the quarterfinal week for Austin Anderson?
SELECT MIN(qtr_final__week_) FROM table_27529608_21 WHERE name_name_of_act = "Austin Anderson"
SELECT MIN("qtr_final__week_") FROM "table_27529608_21" WHERE "Austin Anderson" = "name_name_of_act"