Authority is power that people view as legitimately exercised over them, while coercion is power they consider unjust.
a. true
b. false

Yes, this is correct.

Authority is usually a good thing, for example the elected President of the Unites States has the authority people people gave him the authority.
On the other hand, coercion is seen rather as a negative concept and a problem (and can be corrected to bullying)

To solve their problems, mesopotamians used irrigation, a way of supplying water to an area of land. to irrigate their land, they dug out large storafe basins to hold water supplies these ditches brought water to the feilds. to protect their feilds from flooding, farmers built up the banks of the tigris and euphrates.hope ths !

Correct textbook answers would be 1,3, and 5