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carla looks from the top of a diving board, and lines up a ball floating on the surface of the water with the bottom of the opposite corner of the pool. calculate the total distance across the surface of the pool. explain your reasoning

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Below is the solution:

12/x = 10/9 
10x/ 20 = 108/10 
x = 10.8

9 + 10.8 = 19.8 ft

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