Task: Question Understanding
Input (English): Passage: Hoping to snap a two-game losing streak, the Broncos remained on home ground for an AFC West duel against the Oakland Raiders. The Broncos grabbed the early lead, with quarterback Peyton Manning throwing a 22-yard touchdown pass to tight end Joel Dreessen. The Raiders responded, with a 38-yard field goal by placekicker Sebastian Janikowski, but the Broncos countered, with a 21-yard field goal by placekicker Matt Prater at the end of the first quarter. A 24-yard field goal by Janikowski just before halftime was the only scoring play of the second quarter. The Broncos' offense exploded in the third quarter, with Manning connecting on a 17-yard touchdown pass to wide receiver Eric Decker, followed by a 2-yard touchdown run by running back Willis McGahee and a 14-yard touchdown pass from Manning to running back Lance Ball. Prater added field goals of 43 and 53 yards in the fourth quarter. With the win, the Broncos snapped a four-game home losing streak against the Raiders. Center J. D. Walton suffered a dislocated ankle late in the second quarter, and was placed on the season-ending injured reserve the following day (October 1).
Question: How many yards long, to two decimal places, was the average field goal of the first half?
Output (English): number