Jim's football team started on the 50-yard line.
On the first play, they had a 7-yard gain:
- Starting yard line: 50
- After 7-yard gain: \(50 + 7 = 57\)
On the second play, they lost 10 yards:
- After losing 10 yards: \(57 - 10 = 47\)
Therefore, at the end of the second play, the ball was on the 47-yard line.