15, if you plot the points, then seperate the x and y into two seperate lines, you can create a 3,4,5 triangle to find the distance between the points.
First hit it travels 48 ft
Second hit it travels 24 + 24 ft
third hit 12 + 12
4th hit 6 + 6 ft
Total = 48 + 48 + 24 + 12 = 132 ft Answer
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6 is the answer hope it helps:)
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<em>Hope the link helps! Sorry I didn't explain. I couldn't find the less than sign. </em>