Answer:
\(-22\) degrees Celsius.
Step-by-step explanation:
Let x represent number of kilometers.
We have been given that the temperature decreases by 6.8 degrees Celsius for every increase of 1 kilometer above the ground. So temperature decreased in x hours would be \(-6.8x\).
The ground temperature at Brigham Airport is 12 degrees Celsius. The temperature at an altitude of x kilometers would be \(12-6.8x\).
To find temperature outside a plane flying at an altitude of 5 kilometers, we will substitute \(x=5\) in our expression as:
\(12-6.8(5)\)
\(12-34\)
\(-22\)
Therefore, the temperature outside a plane flying at an altitude of 5 kilometers would be \(-22\) degrees Celsius.
