CREATE TABLE table_50837 ("Year" TEXT, "Team" TEXT, "Attempts" TEXT, "Completions" TEXT, "Completion %" TEXT, "Yards" TEXT)

What was the number of attempts for Vanderberg on Iowa when the recorded yards were 2,249?
SELECT "Attempts" FROM table_50837 WHERE "Team" = 'iowa' AND "Yards" = '2,249'
SELECT "Attempts" FROM "table_50837" WHERE "Team" = 'iowa' AND "Yards" = '2,249'