The New York Giants defeated the Houston Texans 14-10 at Giants Stadium, despite a lackluster performance on both sides of the ball.  The Giants got a break early as Texans place-kicker Kris Brown missed a 42-yard field goal.  The Giants responded with a methodical 68-yard drive.  RB Tiki Barber scored his first touchdown of the season on a 16-yard scamper.  He finished the game with 115 rushing yards and 155 total yards from scrimmage. Houston fought back in the second quarter with a long drive culminating in a Brown field goal.  The Giants put together an excellent drive at the end of the first half, but a holding penalty and two sacks forced them to punt.  In the third quarter, Houston continued its fine play, putting together an 18-play scoring drive finished by a David Carr quarterback draw.  Carr was outstanding on the day completing 21 of 30 passes for 176 yards.  He was not pressured all day, due to injuries to Osi Umenyiora, Justin Tuck, and Michael Strahan (the star defensive ends). Trailing 10-7 in the fourth, the Giants offense finally came alive as QB Eli Manning led an outstanding 66-yard scoring drive utilizing the two-minute offense.  Tight end Jeremy Shockey finished the drive on a three yard play-action toss from Manning putting New York ahead 14-10.  The defense preserved the lead by forcing a Houston fumble late in the game.  The running game then gained two first downs and WR Amani Toomer caught an Eli Manning third down pass to end the game. Jeremy Shockey led the Giants with eight receptions for 66 yards and Manning threw for 179 yards and one touchdown, along with an interception (at the end of the first half).  Mathias Kiwanuka had the only sack of the day for New York.
Question: How many passes of Carr were incomplete?
Answer: 9