2. From the 20th floor of a hotel, an elevator goes down 9 floors and up 7 floors. At what floor does an elevator located?
Solution:
An elevator going down 9 floors and going up 7 floors are represented as -9 and 7.
Add these integers to 20, the floor where the elevator starts moving.
20 + (-9) +7 =
20 + (-9) = 11
11 + 7 = 18
The elevator is located at the 18th floor.
Solution:
An elevator going down 9 floors and going up 7 floors are represented as -9 and 7.
Add these integers to 20, the floor where the elevator starts moving.
20 + (-9) +7 =
20 + (-9) = 11
11 + 7 = 18
The elevator is located at the 18th floor.
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