the 30 yard line
The 30 yard line.
35 yard line
College football kicks off at the 35-yard line.
The team who the safety was against has to kick off to the team that scored the safety (free kick) from the 20 yard line. A free kick means that they can kick off using a tee, or they may punt the ball.
The kickoff is from the kicking team's 30 yard line making the kickoff travel 70 yards to reach the end zone.
The 30-yard line of the team kicking the ball off.
1955 through 1887
"40 yd line." Wrong - it is the 30 yard line now. HS still uses the 40 but college went to the 30 in 2007.
I assume you mean "Where is the spot of the ball for a kick off at the start of the game or the start of the half, or after a touchdown, or successful field goal attempt?" Standard kick of is at your own 35 yard line. Penalty's from previous plays, or an off sides on the kick off, can be enforced on the kickoff, or re-kick, moving the spot of the ball.
No, I personally have never heard that you could. If the other team gets a safety though, then they get 2 points and the other team then has to punt the ball to them from I think the 20 yard line.