Answer:
-5.6
Explanation:
 Given parameters: 
 Temperature at Alto = -3.8°C 
Unknown: 
 The wind chill temperature = ? 
Solution: 
Due to the windchill, temperature in Alto feels colder at -3.8. 
We can infer that usually, the temperature in Alto is not supposed to be up to this value. The windchill reduced the temperature; 
 Temperature in Alto = Original temperature + wind chill temperature
Originally, the temperature would be = -3.8 + 5.6 = 1.8 
So; 
 -3.8 = 1.8 + wind chill temperature 
 Wind chill temperature = -3.8 - 1.8 = -5.6