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Please help me find the answer and explain how you got the answer. While sailing a boat offshore, Donna sees a lighthouse and calculates that

Please help me find the answer and explain how you got the answer.

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While sailing a boat offshore, Donna sees a lighthouse and calculates that the angle of elevation to the top of the lighthouse is 3 , as shown in the accompanying diagram. When she sails her boat 700 feet closer to the lighthouse, she finds that the angle of elevation is now 5. How tall, to the nearest tenth of a foot, is the lighthouse? 5 700 ft ( Not drawn to scale )

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