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Given: Air pressure may be represented as a function of height above the surface of the Earth as
[tex]P=P_0e^{-0.00012h}[/tex]Where h is the height in meters and
[tex]P_0\text{ is the air pressure at sea level.}[/tex]Required: To find out which equation will find the height at which air pressure is 65% of the air pressure at sea level.
Explanation: We are given that air pressure is 65% of the air pressure at sea level i.e.
[tex]\begin{gathered} P=65\%\times P_0 \\ P=0.65P_0 \end{gathered}[/tex]Now putting this value of P in the given function we get
[tex]0.65P_0=P_0e^{-0.00012h}[/tex]This is equivalent to the expression given in option A.
Final Answer: Option A is correct.