Well, if she starts off at the third floor below ground, that is basically counted as -3.
Now, if she needs to go to the 10th floor above ground level, we can simply subtract -3 from 10:
= 10 - (-3)
= 10 + 3
= 13
So, in conclusion, to go from her car to her office, she must go up 13 levels.
Glad I could help and have a fantastic day!
Also, can you please mark my answer as the brainliest answer?
Thanks.