Answer:
29.4 °F
Explanation:
There are ten thousands in 10,000. (Amazing, eh?) So, the temperature will drop by 10 × 1.9 °F = 19 °F.
A drop of 19 °F from 48.4 °F is ...
48.4 -19 = 29.4
The temperature at 10,000 ft will be 29.4 °F.
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