Seriously...? Its 10
10 yards
10
Ten yards.
10 Yards is the First Down.
If there are no penalties the yardage needed is ten (10). Penalties on either offense of defense can alter the number of yards needed but the standard is ten. For example, if a first down is initiated at the 20 yard line and your team is going towards the other team's goal (to score), your team would need to get to the 30 to get another first down. Your team would have 4 downs to accomplish this but often use the 4th down to punt the ball to the other team. The scenario just described does not include penalties which can award an automatic first down or set your team back any number of yards depending on the penalty.
Normally 10 yards, but if you needed to get to the one yard line but kept losing yardage you could possibly need to go 98 yards
10
15 yards and an automatic first down.
In a normal set of downs, the ball must be advanced (by play or penalty) 10 or more yards to get a first down.
In football, you have 4 down or attemps to get so many yards, a third down conversion is where you failed to get the amount of yards on first down and second down then reach it on the third, making it first down again
11 yards to Wes Welker
10 yards for offensive holding, 5 yards and an automatic first down for defensive holding.