Question 1155124
For a ground temperature of 15°C, the air temperature (t) at an altitude of 500 m (h) is 10°C. At 2000 m, the air temperature is -5°C. Use the ordered pairs (h,t).
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To do what?  You didn't say.
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(15 - 10)/500 = 0.01°C/meter
(-5 - 15)/2000 ---> 0.01°C/meter
The 3 points are colinear.