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If you were to walk from your apartment down 10 floors to the resturant and back up 4 floors then what floor will she be on?
Well, if you start at my apartment on the 11th floor then you do |11|-|-10| which is 1. Then you go up 4 floors which is |10|+|4| which makes you final location
The highest point in my building is the 10th floor, the lowest is the -10th floor. If you do |10|+|-10| which is 20 so the difference in the highest point and lowest is 20 floors.
if I was to start at the 20th floor and walk down 2 floors per minute then after 5 minutes I would be at floor 10. To find the answer you do 2 floors* 5 minutes which is 10 floors.
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