An__ is a group of businesses that make an informal agreement to cooperate in controlling a market or industry.

Pool

Explanation:

Given that pool is a term in business that is used to describe a form of the agreement made by the members of the pool with the fundamental purpose of retaining powerful control over prices. It involves producers of similar products that wish to standardize the product prizes.

Hence, in this case, a POOL is a group of businesses that make an informal agreement to cooperate in controlling a market or industry.

answer: 25.8 years old or 25 years old

answer; /// i do believe that the correct answer is (a); a farming tribe that settled primarily along the mississippi and arkansas rivers;