Question

The atmospheric pressure P in pounds per square inch (psi) is given by the formula below, where a is the altitude above sea level (in miles). If a city has an atmospheric pressure of 13.25 psi, what is its altitude? (Recall that 1 mi = 5,280 ft. Round your answer to the nearest foot.) P = 14.7 e**(-0.21 a)

Answer 1

13.25 = 14.7 e ^ (-0.21 a)
e ^ (-0.21 a) = 13.25 / 14.7
take logs of both sides to find a

Answer 2

Show us how to do that, I am using a TI-25x and it has a button labeled LN.