Each tree is about 40 feet tall
The trees are about 130 feet apart.
Slope Constraint: the slope of the zip line should be 6 to 8 feet of vertical change for every 100 feet of horizontal change.
Chantal decides to let you choose the slope for the zip line. Choose a slope that is within the constraints. Using that slope, how much higher is the starting point of the zip line going to need to be than the ending point? Enter the difference, in feet, between the heights of the starting and ending points.
