1.  In triangle ABC, angle A = 90^o, a = 29, and b = 21. Find c, angle B, and angle C.
   
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2. A 20-foot ladder leaning against the side of a house makes a 75^o angle with the ground. How far up the side of the house does the ladder reach?
   
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3. From a 150-foot observation tower on the coast, a Coast Guard officer sights a boat in difficulty. The angle of depression of the boat is 4^o. How far is the boat from the shoreline?
   
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