A large office building has floors above and below ground. The ground-level floor of the building is labeled Floor 0. Tanya stops into the elevator outside of her office. She rides the elevator down 9 floors, then up 5 floors, down 2 floors, and up 3 floors. Tanya exit the elevator on floor -2. Tanyś office on what floor of this building?
Tanya started on floor 0 and traveled down 9 floors, so she was on floor 0 - 9 = -9.
She then went up 5 floors to floor -9 + 5 = -4.
From there, Tanya went down 2 floors to floor -4 - 2 = -6.
Finally, she went up 3 floors to floor -6 + 3 = -3.
Therefore, Tanya's office is on floor -3.