In expanded form, the answer would look like this:
100,000 + 10,000 + 4,000 + 6
10/2x2= 10
Explanation:
10 divided by 2=5
5x2=10
Multiply 3 1/2 by two because the distance was hiked twice, then add 2 3/8.
=(3 1/2 * 2) + 2 3/8
=7 + 2 3/8
=9 3/8 miles hiked total
ANSWER: 9 3/8 miles
Hope this helps! :)