Final answer:
The total distance driven is 33.23 km.
Step-by-step explanation:
To find the total distance driven, you need to add the distances for driving to school and driving to your friend's house. The distance driven to school is 20.45 km, and the distance driven to your friend's house is 12.78 km.
To find the total distance, you can add these two distances together:
20.45 km + 12.78 km = 33.23 km
Therefore, the total distance driven is 33.23 km.
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