If you cannot write down the first step to a problem, you should the problem to help you remember how to solve it.
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At sea level, the pressure is 1013, that's when the altitude is at 0, sea level, let's see
so, the inital amount is 1013, when t = 0,
now, to check the atmospheric pressure at 4000, simply set t = 4000, to get A.
so, the inital amount is 1013, when t = 0,
now, to check the atmospheric pressure at 4000, simply set t = 4000, to get A.