The Cincinnati Bengals began their season at Gillette Stadium for an AFC duel with the New England Patriots. In the first quarter, the Bengals trailed early when Patriots quarterback Tom Brady got a 9-yard TD pass to wide receiver Wes Welker, followed by kicker Stephen Gostkowski hitting a 32-yard field goal. In the second quarter, the Bengals struggled further when Brady made a 4-yard TD pass to Wes Welker, followed by linebacker Gary Guyton returning an interception 59 yards for a touchdown. Then, the Bengals made their first score of the half when kicker Mike Nugent nailed a 54-yard field goal. In the third quarter, the Patriots increased their lead when wide receiver Brandon Tate returned the second half's opening kickoff 97 yards for a touchdown. After that, the Bengals replied with quarterback Carson Palmer making a 1-yard TD pass to tight end Jermaine Gresham, followed by Palmer's 28-yard touchdown pass to wide receiver Chad Ochocinco. In the fourth quarter, the Patriots scored again with Brady making a 1-yard TD pass to tight end Rob Gronkowski. The Bengals replied with running back Cedric Benson making a 1-yard TD run, but Cincinnati couldn't get any closer to New England's lead.
Answer this question: how many yards did brady pass to welker?
4