Answer:
Renee will need to hike 1 1/2 more miles.
Step-by-step explanation:
If she hiked to her spot of 7 3/4 miles, she would need to hike another
7 3/4 more miles back. So, if she has hiked back 6 1/4 miles so far, you would subtract 7 3/4 - 6 1/4 to get 1 1/2 more miles!
Hope this answer and explanation helps you!