18. A ladder 25 feet long is leaning against a wall that is perpendicular to level ground. The bottom of the ladder is 7 feet from the base of the wall. If the top of the ladder slips down 4 feet, how many feet will the bottom of the ladder slip?
(A) 4 (B) 5 (C) 8
(D) 9 (E) 15
the answer is c. can anyone explain this?
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