$\"\"$

The function is $\"\"$ , where T is temperature in $\"\"$ and h is the height in thousands of feet.

Substitute the value of $\"\"$ in the original function.

$\"\"$

Subtract 68 from each side.

$\"\"$

$\"\"$ $\"\"$

Divide each side by $\"\"$ .

$\"\"$

Cancel common terms.

$\"\"$ .

The value of $\"\"$ then the height is 35,000 feet. $\"\"$

The height is 35,000 feet.