Answer:
1) -95.
2) 15.
3) The conference center is on floor 5.
Explanation:
1) Evaluating gives
![-52-30-13=-(52+30+13)=-(95)=-95.](https://img.qammunity.org/2022/formulas/mathematics/college/kph0k764ccc3ebff3udm6uvxir7rpf02jb.png)
2) Substituting gives
![x+27=(-12)+27=15.](https://img.qammunity.org/2022/formulas/mathematics/college/7w59nfc1vlxfklfow38y1hd0ysi475dxod.png)
3) After going 4 floors down, we are on level -4. After going 9 floors up to the desired room, we are on level -4+9=5. So the conference center is on floor 5.