To use the tree house as the start of the zip line, the cable needs to be attached to the starting tree at a height 18 feet above the ground.
To meet the slope constraint, Esteban wants to change the height 7 feet and end
the zip line at a height 11 feet above the ground. He claims this vertical change
meets the slope constraint.
Test Esteban's claim for Tree A and Tree B. Use specific numbers from the
situation to justify or refute whether having a vertical change of 7 feet will satisfy
the slope constraint for each tree.