Teresa is training for a triathlon, a timed race that combines swimming, biking, and running. Consider the following sentence: Teresa has only 20 hours this week that she can devote to training. Each hour she spends swimming is an hour that she can't spend biking or running. Which basic principle of individual choice do these statements best illustrate? People face trade-offs. Teresa can use time most efficiently by spending the same amounts of time on swimming, biking, and running. People usually exploit opportunities to make themselves better off. Teresa has an incentive to spend more time on swimming than on biking or running.

People face trade-offs

Explanation:

It demonstrates this because Teresa must decide what she should practice at a given moment, given her limited time. This shows opportunity cost.

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jefferson hoped to establish trade with the native american people of the west and find a water route to the pacific. jefferson also was fascinated by the prospect of what could be learned about the geography of the west, the lives and languages of the native americans, the plants and animals, the soil, the rocks, the weather, and how they differed from those in the east.

the economic difference between the three colonial regions. shipbuilding, whaling, fishing, and trapping where also main factors to the economy. the southern regional colonies economy was based on sugarcane, rice, cotton, tobacco, and indigo.