Answer :
Length of Bait which is below the surface of Water=2 feet
Total Length of Bait which is Reeled out =19 feet
It means total length of bait which is not inside the water, that is above surface of water
=-19 feet +2 feet
= -17 feet
Length of bait which is reeled out after reeling in =7 feet
Final position of the bait relative to the surface of the water
= -17 feet+7 feet
= -10 feet, means the length which is hanging out.
So, Length of bait above the surface of water,from the dock
=|-10 feet|
=10 feet
Yes, Correct.