math

The atmospheric pressure P in pounds per square inch (psi) is given by
P = 14.7 e−0.21 awhere a is the altitude above sea level (in miles). If a city has an atmospheric pressure of 11.11 psi, what is its altitude? (Recall that 1 mi = 5,280 ft.

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asked by libby
  1. just solve for a:

    14.7 e^(-0.21a) = 11.11
    e^(-0.21a) = 0.7558
    -0.21a = ln 07558 = -0.28
    a = 4/3

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    posted by Steve

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