18. From the top of a light house 53 m above the water, the angle of depression of a boat due south is 18056’47”. Calculate the speed of the boat, if after it moves due west for 2 minutes the angle of depression is 14020’. A. 69.26 meters/min       B. 48.17 meters/min     C. 87.35 meters/min     D. 29.47 meters/min   31. The sum of the digits of a two-digit number is 11. If the digits are reversed, the resulting number is 7 more than twice the original number. What is the original number? A. 38      B. 53      C.83      D. 44

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