The earth's atmospheric pressure, $P$, in terms of height above sea level is often modeled by an exponential decay function. The pressure at sea level is 1013 millibars and the pressure decreases by 14% for every kilometer above sea level.

(a) What is the atmospheric pressure at 30 km?
millibars

(b) Estimate the altitude $h$ at which the atmospheric pressure equals 800 millibars.
km.