CREATE TABLE table_59615 ("Combined" TEXT, "50 yard Freestyle" TEXT, "100 yard Freestyle" TEXT, "200 yard Freestyle" TEXT, "500 yard Freestyle" TEXT, "100 yard Backstroke" TEXT, "100 yard Butterfly" TEXT)

What 100 yard Backstroke has a 100 yard Freestyle of helen yee (sierra vista)?
SELECT "100 yard Backstroke" FROM table_59615 WHERE "100 yard Freestyle" = 'helen yee (sierra vista)'
SELECT "100 yard Backstroke" FROM "table_59615" WHERE "100 yard Freestyle" = 'helen yee (sierra vista)'