Final answer:
To find the actual length of the road, we multiply the road's map length of 9.1 cm by the scale of 4.2 km per cm, leading to an actual distance of 38.22 km.
Step-by-step explanation:
The question asks us to calculate the actual length of a road on a map using its scale of 1 cm to 4.2 km. To find the actual length, we multiply the measure of the road on the map (9.1 cm) by the scale (4.2 km per cm). So, we perform the calculation 9.1 cm × 4.2 km/cm = 38.22 km.
Since the answer must be a numerical value representing the length of the road, we do not need to address the conversion to miles or use any Goo_gle Earth tools as mentioned in the additional information. The correct answer, therefore, is A. 38.22 km.