In a week you could read two books or see four movies. the opportunity cost of choosing to read one book is

The answer is:

two movies

I could read two books in a week.

the answer to your question is:

strong-mayor system

the quote by walter cronkite contributes to the central idea of the text by supporting the central idea. cronkite argues that what is deemed “right” for and in america may not be good for other countries. this supports the central idea of the text, that the vietnam war was unpopular in america for multiple reasons- including cronkite’s.