Question

Which integer represents this scenario?


an elevator goes down 2 floors

Answer 1

We usually define the cases like this as follows:

If we go upwards N units, then we add N.

If we go downwards N units, then we subtract N.

In this case, suppose that the elevator is originally on the floor K (can be any integer number larger or equal than 2)

Then the elevator goes down 2 floors.

Then now the elevator will be on the floor (K - 2)

Then the integer that represents this scenario is -2, which represents the change in the floor number where the elevator is.