"40 yd line."
Wrong - it is the 30 yard line now. HS still uses the 40 but college went to the 30 in 2007.
In football, the kick off positions used in a game are the 35-yard line for college football and the 30-yard line for professional football. The team kicking off can choose to kick the ball from the ground or use a kicking tee.
Fifty yards. It extends from 25-yard line to 25-yard line. (NCAA Rules and Interpretations: Rule 1.2.4a)
The 20 yard line
40 yard line
In US professional football (NFL) , the ball is spotted at the 2-yard line, the same location as the line of scrimmage for a kicked extra point (which actually travels 15 yards, from near the 5 yard line to the goalposts). The NCAA (college football) places it at the 3-yard line. Canadian football places the ball at the 5-yard line.
The 50 yard line.
Where the kick returner is standing.
The ball is teed-up at the 40-yard line of the kicking team.
The red zone in football begins at the opponent's 20-yard line.
The kickoff is from the kicking team's 30 yard line making the kickoff travel 70 yards to reach the end zone.
The ball is placed at the 2 yard line in the NFL and the 3 yard line in college football.
It depends on the league and level of football, but in the NFL, the football is normally placed on the 2 yard line for both a point-after kick or a 2-point conversion attempt. In high school, it's placed on the 3 yard line. CFL rules put it on the 5 yard line.