At the end of the semester, you agree to give your accounting textbook to a classmate in exchange for her economics textbook. this is an example of

This would be a perfect example of the system of barter as you are trading one book for the other. You can see from here what barter is, a trading system which involves direct exchange of goods without some kind of medium of exchange, for example money. Services can also be traded this way.

Giving women the right to vote was not accomplished by the northwest ordinance. it did, however, make plans for territories to become states, and forbidding slavery in the territory and providing for public education.