Like the romans, and despite the fact that they lacked wheeled transport, the incas were well aware of how crucial paved and well-supplied roads were for
a. easing interstate commerce. b. impressing foreign visitors. c. transporting soldiers. d. aiding hotel keepers and restaurateurs.

Explanation:

The Incas empire had a population of more than ten million, it had large stone cities, advanced government, road system and tax system. But they didn't had other technologies which are considered to be vital for advanced societies such as they didn't use wheels for transport, lack of writing system for record keeping and they didn't use iron tools. But they were advanced in road building. The Incas had large roads that went throughout their empire. Roads were constructed even in steepest areas and were well paved, bridges were constructed where the road had to cross the rivers. Roads were used for communication, transporting goods and moving the army.

the answer is b. 300t + 3/2xt