Aguest gets out of his car on floor -6 and travels 15 floors. what floor will he be at when the elevator stops

There can be two answer choices. As it doesn't specify which way the guest travels the 15 floors, it can go up, or go down.

If the elevator goes up:

Add the two numbers together

-6 + 15 = 15 - 6 = 9

9 is your answer

If the elevator goes down:

Subtract the two numbers

-6  - 15 = -21

-21 is your answer

hope this helps

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