ANSWER
15 kilometers
Step-by-step explanation
A diagram of this situation is,
The distance from each town to the airport and the distance between them form a right triangle, where the hypotenuse is 17 km long and one of the legs is 8 km long.
Using the Pythagorean theorem,

Solving for d,
![d=\sqrt[]{17^2-8^2_{}}=\sqrt[]{289-64}=\sqrt[]{225}=15](https://img.qammunity.org/2023/formulas/mathematics/college/8vxwl4c7btuo6gkx3vaymryn1p0fi4vcan.png)
Hence, the distance from the airport to Somerville is 15 km.