What tribe made up Athens

Ineed answers 5 and 6 on my social studies homework reply to this question i posted

Which situation would be considered an example of the freedom of association? a. three students write a letter to a local newspaper demanding that a teacher be fired. b. a group forms on a college campus to support a particular political candidate. c. an individual purchases a membership to a local gym. d. a religious organization buys several local lots in order to construct a new church building.

Why might it be important to know a currency’s exchange rate