To calculate Chris's gain in elevation from Point A on Little Brook to the top of Outlook Hill, you need to find the difference in elevation between the two points.
1. Identify the elevation at Point A on Little Brook. In this case, it is 835 feet.
2. Determine the elevation at the top of Outlook Hill, which is 600 feet.
3. Subtract the elevation of Point A from the elevation of Outlook Hill:
600 feet (Outlook Hill) - 835 feet (Point A) = -235 feet
Therefore, Chris experiences a decrease in elevation of 235 feet as he hikes from Point A on Little Brook to the top of Outlook Hill.