It's negative addition and subtraction, The meteorological observation data of the sounding balloon in a certain place show that the air temperature will decrease by about 6 ℃ for every 1 km increase in height. If the ground temperature is 21 ℃ and the temperature is minus 36 ℃ in the upper air, what is the height of this place? The meteorological observation data of a sounding balloon in a certain place show that the temperature will decrease by about 6 ℃ for every 1 km increase in altitude. If the ground temperature is 21 ℃ and the temperature at a place in the upper air is minus 39 ℃, how many kilometers is the altitude here

Altitude = [21 - (- 36)] 6 = 9.5km

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