To find the altitude change when Lila travels from her home to school, we need to calculate the difference in altitude between her house and the school.
- Lila's house is at an altitude of -12 meters (since it is 12 meters below sea level).
- The school is at an altitude of +6 meters (since it is 6 meters above sea level).
To find the total altitude change, we can use the following calculation:
\[ \text{Altitude Change} = \text{Altitude of School} - \text{Altitude of House} \]
Substituting the altitudes:
\[ \text{Altitude Change} = 6 - (-12) \]
This simplifies to:
\[ \text{Altitude Change} = 6 + 12 = 18 \]
Therefore, Lila travels 18 meters in altitude when going from home to school.