Robin Hood plans to use a 30-ft ladder to reach the castle window of Maid Marian. Little John, who made the ladder, advised Robin that the angle of elevation of the ladder must be between 55° and 70° for safety. What is the minimum height that can safely be reached by the top of the ladder when it is placed against the 50-ft castle wall? Round to the nearest tenth of a foot. Your answer will be in feet. (a) 24.6
(b) 26.1
(c) 28.2
(d) 42.8
(e) None of these