Answer :
slope = rise/run
the ladder "rises" to 13 feet above the ground
the ladder "runs" 3 feet from the base of the ladder to the tree
so: slope = rise/run = 13/3
the ladder "rises" to 13 feet above the ground
the ladder "runs" 3 feet from the base of the ladder to the tree
so: slope = rise/run = 13/3