Answer:
2.1 miles
Step-by-step explanation:
The problem wants you to find 12% of 17.4 miles, which is how far they hiked on the second day. To do this you multiply 17.4 by 0.12.
17.4 * 0.12 = 2.08800
Rounded to the nearest 10th of a mile (tenth) would be 2.1 miles.
Therefore the group hiked a total of 2.1 miles on the second day.