Average sea-level air pressure is approximately 1013.25 mbar (mbar stands for millibar). It has been found that the air pressure h meters above sea level is given (at least approximately) by the formula $$P(h) = 1013.25e^{-(0.000118576)h}$$ Approximate the instantaneous rate of change at h = 1000 meters by computing the average rate of change from 1000 to 1001. Interpret your answer in the context of air pressure.
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