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On a recent trip, Juan started at an elevation of 1200 feet above sea level. He descended into a valley 20.4 feet below sea level. Which of the following shows one way to calculate how many feet he descended in all? A. -20.4 – (-1200) B. 1200 – 20.4 C. -20.4 + 1600 D. 1200 – (-20.4)