$\"\"$

The Pressure function is $\"\"$ .

Where height of aircraft $\"\"$ is measured in kilometers.

(a)

Find the height of aircraft $\"\"$ , when the atmospheric pressure is $\"\"$ millimeters.

Substitute $\"\"$ in $\"\"$ .

$\"\"$

From the definition $\"x$ if and only if $\"y$ .

$\"\"$

The height of aircraft is $\"\"$ kilometers.

$\"\"$

(b)